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[PATCH v6 08/27] line-log: stop assigning string constant to file parent buffer

From
Patrick Steinhardt <ps@pks.im>
Date
Jun 7, 2024, 06:38 UTC
Message-ID
<777b93a89aff6db2422c257870225e43ce342eb9.1717740366.git.ps@pks.im>
In-Reply-To
<cover.1717740365.git.ps@pks.im>

Stop assigning a string constant to the file parent buffer and instead assign an allocated string. While the code is fine in practice, it will break once we compile with `-Wwrite-strings`.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 line-log.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/line-log.c b/line-log.c
index 8ff6ccb772..bd3e663c24 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1032,6 +1032,7 @@ static int process_diff_filepair(struct rev_info *rev,
 	struct range_set tmp;
 	struct diff_ranges diff;
 	mmfile_t file_parent, file_target;
+	char *parent_data_to_free = NULL;
 
 	assert(pair->two->path);
 	while (rg) {
@@ -1056,7 +1057,7 @@ static int process_diff_filepair(struct rev_info *rev,
 		file_parent.ptr = pair->one->data;
 		file_parent.size = pair->one->size;
 	} else {
-		file_parent.ptr = "";
+		file_parent.ptr = parent_data_to_free = xstrdup("");
 		file_parent.size = 0;
 	}
 
@@ -1075,6 +1076,7 @@ static int process_diff_filepair(struct rev_info *rev,
 
 	diff_ranges_release(&diff);
 
+	free(parent_data_to_free);
 	return ((*diff_out)->parent.nr > 0);
 }
 
-- 
2.45.2.436.gcd77e87115.dirty
Previous: Patrick SteinhardtNext: Patrick Steinhardt
Message 185 of 205 in “Compile with `-Wwrite-strings`”
  1. 00/19 Compile with `-Wwrite-strings`Patrick Steinhardt, May 29, 2024
  2. 01/19 global: improve const correctness when assigning string constantsPatrick Steinhardt, May 29, 2024
  3. Junio C HamanoMay 29, 2024
  4. Patrick SteinhardtMay 30, 2024
  5. 02/19 global: assign non-const strings as requiredPatrick Steinhardt, May 29, 2024
  6. Junio C HamanoMay 29, 2024
  7. Patrick SteinhardtMay 30, 2024
  8. Junio C HamanoMay 30, 2024
  9. Patrick SteinhardtMay 31, 2024
  10. Patrick SteinhardtMay 31, 2024
  11. Junio C HamanoMay 31, 2024
  12. Junio C HamanoMay 31, 2024
  13. Jeff KingJun 5, 2024
  14. Junio C HamanoJun 5, 2024
  15. Jeff KingJun 8, 2024
  16. Patrick SteinhardtJun 6, 2024
  17. 03/19 global: convert intentionally-leaking config strings to constsPatrick Steinhardt, May 29, 2024
  18. Junio C HamanoMay 29, 2024
  19. Patrick SteinhardtMay 30, 2024
  20. Junio C HamanoMay 30, 2024
  21. 04/19 compat/win32: fix const-correctness with string constantsPatrick Steinhardt, May 29, 2024
  22. 05/19 reftable: improve const correctness when assigning string constantsPatrick Steinhardt, May 29, 2024
  23. Junio C HamanoMay 29, 2024
  24. Patrick SteinhardtMay 30, 2024
  25. Junio C HamanoMay 30, 2024
  26. 06/19 refspec: remove global tag refspec structurePatrick Steinhardt, May 29, 2024
  27. Junio C HamanoMay 29, 2024
  28. 07/19 http: do not assign string constant to non-const fieldPatrick Steinhardt, May 29, 2024
  29. Junio C HamanoMay 29, 2024
  30. 08/19 line-log: always allocate the output prefixPatrick Steinhardt, May 29, 2024
  31. Junio C HamanoMay 29, 2024
  32. 09/19 object-file: make `buf` parameter of `index_mem()` a constantPatrick Steinhardt, May 29, 2024
  33. Junio C HamanoMay 29, 2024
  34. 10/19 parse-options: cast long name for OPTION_ALIASPatrick Steinhardt, May 29, 2024
  35. 11/19 send-pack: always allocate receive statusPatrick Steinhardt, May 29, 2024
  36. 12/19 remote-curl: avoid assigning string constant to non-const variablePatrick Steinhardt, May 29, 2024
  37. Junio C HamanoMay 29, 2024
  38. Patrick SteinhardtMay 30, 2024
  39. 13/19 revision: always store allocated strings in output encodingPatrick Steinhardt, May 29, 2024
  40. Junio C HamanoMay 29, 2024
  41. 14/19 mailmap: always store allocated strings in mailmap blobPatrick Steinhardt, May 29, 2024
  42. 15/19 imap-send: drop global `imap_server_conf` variablePatrick Steinhardt, May 29, 2024
  43. 16/19 imap-send: fix leaking memory in `imap_server_conf`Patrick Steinhardt, May 29, 2024
  44. Junio C HamanoMay 29, 2024
  45. Patrick SteinhardtMay 30, 2024
  46. Junio C HamanoMay 30, 2024
  47. 17/19 builtin/rebase: adapt code to not assign string constants to non-constPatrick Steinhardt, May 29, 2024
  48. Junio C HamanoMay 29, 2024
  49. Patrick SteinhardtMay 30, 2024
  50. 18/19 builtin/merge: always store allocated strings in `pull_twohead`Patrick Steinhardt, May 29, 2024
  51. 19/19 config.mak.dev: enable `-Wwrite-strings` warningPatrick Steinhardt, May 29, 2024
  52. Patrick SteinhardtMay 29, 2024
  53. 00/19 Compile with `-Wwrite-strings`Patrick Steinhardt, May 30, 2024
  54. 01/19 global: improve const correctness when assigning string constantsPatrick Steinhardt, May 30, 2024
  55. 02/19 global: assign non-const strings as requiredPatrick Steinhardt, May 30, 2024
  56. 03/19 global: convert intentionally-leaking config strings to constsPatrick Steinhardt, May 30, 2024
  57. 04/19 compat/win32: fix const-correctness with string constantsPatrick Steinhardt, May 30, 2024
  58. 05/19 refspec: remove global tag refspec structurePatrick Steinhardt, May 30, 2024
  59. 06/19 http: do not assign string constant to non-const fieldPatrick Steinhardt, May 30, 2024
  60. 07/19 line-log: always allocate the output prefixPatrick Steinhardt, May 30, 2024
  61. 08/19 object-file: make `buf` parameter of `index_mem()` a constantPatrick Steinhardt, May 30, 2024
  62. 09/19 parse-options: cast long name for OPTION_ALIASPatrick Steinhardt, May 30, 2024
  63. 10/19 send-pack: always allocate receive statusPatrick Steinhardt, May 30, 2024
  64. 11/19 remote-curl: avoid assigning string constant to non-const variablePatrick Steinhardt, May 30, 2024
  65. 12/19 revision: always store allocated strings in output encodingPatrick Steinhardt, May 30, 2024
  66. 13/19 mailmap: always store allocated strings in mailmap blobPatrick Steinhardt, May 30, 2024
  67. 14/19 imap-send: drop global `imap_server_conf` variablePatrick Steinhardt, May 30, 2024
  68. 15/19 imap-send: fix leaking memory in `imap_server_conf`Patrick Steinhardt, May 30, 2024
  69. 16/19 builtin/rebase: do not assign default backend to non-constant fieldPatrick Steinhardt, May 30, 2024
  70. 17/19 builtin/rebase: always store allocated string in `options.strategy`Patrick Steinhardt, May 30, 2024
  71. 18/19 builtin/merge: always store allocated strings in `pull_twohead`Patrick Steinhardt, May 30, 2024
  72. 19/19 config.mak.dev: enable `-Wwrite-strings` warningPatrick Steinhardt, May 30, 2024
  73. Junio C HamanoMay 31, 2024
  74. Patrick SteinhardtMay 31, 2024
  75. 00/27 Compile with `-Wwrite-strings`Patrick Steinhardt, Jun 3, 2024
  76. 01/27 global: improve const correctness when assigning string constantsPatrick Steinhardt, Jun 3, 2024
  77. 02/27 global: convert intentionally-leaking config strings to constsPatrick Steinhardt, Jun 3, 2024
  78. 03/27 refs/reftable: stop micro-optimizing refname allocations on copyPatrick Steinhardt, Jun 3, 2024
  79. Junio C HamanoJun 3, 2024
  80. 04/27 reftable: cast away constness when assigning constants to recordsPatrick Steinhardt, Jun 3, 2024
  81. 05/27 refspec: remove global tag refspec structurePatrick Steinhardt, Jun 3, 2024
  82. Junio C HamanoJun 3, 2024
  83. 06/27 builtin/remote: cast away constness in `get_head_names()`Patrick Steinhardt, Jun 3, 2024
  84. 07/27 diff: cast string constant in `fill_textconv()`Patrick Steinhardt, Jun 3, 2024
  85. 08/27 line-log: stop assigning string constant to file parent bufferPatrick Steinhardt, Jun 3, 2024
  86. 09/27 line-log: always allocate the output prefixPatrick Steinhardt, Jun 3, 2024
  87. 10/27 entry: refactor how we remove items for delayed checkoutsPatrick Steinhardt, Jun 3, 2024
  88. 11/27 ident: add casts for fallback name and GECOSPatrick Steinhardt, Jun 3, 2024
  89. 12/27 object-file: mark cached object buffers as constPatrick Steinhardt, Jun 3, 2024
  90. 13/27 object-file: make `buf` parameter of `index_mem()` a constantPatrick Steinhardt, Jun 3, 2024
  91. 14/27 pretty: add casts for decoration option pointersPatrick Steinhardt, Jun 3, 2024
  92. 15/27 compat/win32: fix const-correctness with string constantsPatrick Steinhardt, Jun 3, 2024
  93. Eric SunshineJun 3, 2024
  94. Junio C HamanoJun 3, 2024
  95. Patrick SteinhardtJun 4, 2024
  96. 16/27 http: do not assign string constant to non-const fieldPatrick Steinhardt, Jun 3, 2024
  97. 17/27 parse-options: cast long name for OPTION_ALIASPatrick Steinhardt, Jun 3, 2024
  98. 18/27 send-pack: always allocate receive statusPatrick Steinhardt, Jun 3, 2024
  99. 19/27 remote-curl: avoid assigning string constant to non-const variablePatrick Steinhardt, Jun 3, 2024
  100. 20/27 revision: always store allocated strings in output encodingPatrick Steinhardt, Jun 3, 2024
  101. 21/27 mailmap: always store allocated strings in mailmap blobPatrick Steinhardt, Jun 3, 2024
  102. 22/27 imap-send: drop global `imap_server_conf` variablePatrick Steinhardt, Jun 3, 2024
  103. 23/27 imap-send: fix leaking memory in `imap_server_conf`Patrick Steinhardt, Jun 3, 2024
  104. 24/27 builtin/rebase: do not assign default backend to non-constant fieldPatrick Steinhardt, Jun 3, 2024
  105. 25/27 builtin/rebase: always store allocated string in `options.strategy`Patrick Steinhardt, Jun 3, 2024
  106. 26/27 builtin/merge: always store allocated strings in `pull_twohead`Patrick Steinhardt, Jun 3, 2024
  107. 27/27 config.mak.dev: enable `-Wwrite-strings` warningPatrick Steinhardt, Jun 3, 2024
  108. Junio C HamanoJun 3, 2024
  109. 00/27 Compile with `-Wwrite-strings`Patrick Steinhardt, Jun 4, 2024
  110. 01/27 global: improve const correctness when assigning string constantsPatrick Steinhardt, Jun 4, 2024
  111. 02/27 global: convert intentionally-leaking config strings to constsPatrick Steinhardt, Jun 4, 2024
  112. 03/27 refs/reftable: stop micro-optimizing refname allocations on copyPatrick Steinhardt, Jun 4, 2024
  113. 04/27 reftable: cast away constness when assigning constants to recordsPatrick Steinhardt, Jun 4, 2024
  114. 05/27 refspec: remove global tag refspec structurePatrick Steinhardt, Jun 4, 2024
  115. 06/27 builtin/remote: cast away constness in `get_head_names()`Patrick Steinhardt, Jun 4, 2024
  116. 07/27 diff: cast string constant in `fill_textconv()`Patrick Steinhardt, Jun 4, 2024
  117. 08/27 line-log: stop assigning string constant to file parent bufferPatrick Steinhardt, Jun 4, 2024
  118. 09/27 line-log: always allocate the output prefixPatrick Steinhardt, Jun 4, 2024
  119. 10/27 entry: refactor how we remove items for delayed checkoutsPatrick Steinhardt, Jun 4, 2024
  120. 11/27 ident: add casts for fallback name and GECOSPatrick Steinhardt, Jun 4, 2024
  121. 12/27 object-file: mark cached object buffers as constPatrick Steinhardt, Jun 4, 2024
  122. Junio C HamanoJun 6, 2024
  123. Junio C HamanoJun 6, 2024
  124. Patrick SteinhardtJun 6, 2024
  125. Junio C HamanoJun 6, 2024
  126. Patrick SteinhardtJun 7, 2024
  127. 13/27 object-file: make `buf` parameter of `index_mem()` a constantPatrick Steinhardt, Jun 4, 2024
  128. 14/27 pretty: add casts for decoration option pointersPatrick Steinhardt, Jun 4, 2024
  129. 15/27 compat/win32: fix const-correctness with string constantsPatrick Steinhardt, Jun 4, 2024
  130. 16/27 http: do not assign string constant to non-const fieldPatrick Steinhardt, Jun 4, 2024
  131. 17/27 parse-options: cast long name for OPTION_ALIASPatrick Steinhardt, Jun 4, 2024
  132. 18/27 send-pack: always allocate receive statusPatrick Steinhardt, Jun 4, 2024
  133. 19/27 remote-curl: avoid assigning string constant to non-const variablePatrick Steinhardt, Jun 4, 2024
  134. 20/27 revision: always store allocated strings in output encodingPatrick Steinhardt, Jun 4, 2024
  135. 21/27 mailmap: always store allocated strings in mailmap blobPatrick Steinhardt, Jun 4, 2024
  136. 22/27 imap-send: drop global `imap_server_conf` variablePatrick Steinhardt, Jun 4, 2024
  137. 23/27 imap-send: fix leaking memory in `imap_server_conf`Patrick Steinhardt, Jun 4, 2024
  138. 24/27 builtin/rebase: do not assign default backend to non-constant fieldPatrick Steinhardt, Jun 4, 2024
  139. Phillip WoodJun 4, 2024
  140. Patrick SteinhardtJun 5, 2024
  141. Phillip WoodJun 5, 2024
  142. Patrick SteinhardtJun 6, 2024
  143. Junio C HamanoJun 5, 2024
  144. 25/27 builtin/rebase: always store allocated string in `options.strategy`Patrick Steinhardt, Jun 4, 2024
  145. Phillip WoodJun 4, 2024
  146. 26/27 builtin/merge: always store allocated strings in `pull_twohead`Patrick Steinhardt, Jun 4, 2024
  147. 27/27 config.mak.dev: enable `-Wwrite-strings` warningPatrick Steinhardt, Jun 4, 2024
  148. 00/27 Compile with `-Wwrite-strings`Patrick Steinhardt, Jun 6, 2024
  149. 01/27 global: improve const correctness when assigning string constantsPatrick Steinhardt, Jun 6, 2024
  150. 02/27 global: convert intentionally-leaking config strings to constsPatrick Steinhardt, Jun 6, 2024
  151. 03/27 refs/reftable: stop micro-optimizing refname allocations on copyPatrick Steinhardt, Jun 6, 2024
  152. 04/27 reftable: cast away constness when assigning constants to recordsPatrick Steinhardt, Jun 6, 2024
  153. 05/27 refspec: remove global tag refspec structurePatrick Steinhardt, Jun 6, 2024
  154. 06/27 builtin/remote: cast away constness in `get_head_names()`Patrick Steinhardt, Jun 6, 2024
  155. 07/27 diff: cast string constant in `fill_textconv()`Patrick Steinhardt, Jun 6, 2024
  156. 08/27 line-log: stop assigning string constant to file parent bufferPatrick Steinhardt, Jun 6, 2024
  157. 09/27 line-log: always allocate the output prefixPatrick Steinhardt, Jun 6, 2024
  158. 10/27 entry: refactor how we remove items for delayed checkoutsPatrick Steinhardt, Jun 6, 2024
  159. 11/27 ident: add casts for fallback name and GECOSPatrick Steinhardt, Jun 6, 2024
  160. 12/27 object-file: mark cached object buffers as constPatrick Steinhardt, Jun 6, 2024
  161. Junio C HamanoJun 6, 2024
  162. 13/27 object-file: make `buf` parameter of `index_mem()` a constantPatrick Steinhardt, Jun 6, 2024
  163. 14/27 pretty: add casts for decoration option pointersPatrick Steinhardt, Jun 6, 2024
  164. 15/27 compat/win32: fix const-correctness with string constantsPatrick Steinhardt, Jun 6, 2024
  165. 16/27 http: do not assign string constant to non-const fieldPatrick Steinhardt, Jun 6, 2024
  166. 17/27 parse-options: cast long name for OPTION_ALIASPatrick Steinhardt, Jun 6, 2024
  167. 18/27 send-pack: always allocate receive statusPatrick Steinhardt, Jun 6, 2024
  168. 19/27 remote-curl: avoid assigning string constant to non-const variablePatrick Steinhardt, Jun 6, 2024
  169. 20/27 revision: always store allocated strings in output encodingPatrick Steinhardt, Jun 6, 2024
  170. 21/27 mailmap: always store allocated strings in mailmap blobPatrick Steinhardt, Jun 6, 2024
  171. 22/27 imap-send: drop global `imap_server_conf` variablePatrick Steinhardt, Jun 6, 2024
  172. 23/27 imap-send: fix leaking memory in `imap_server_conf`Patrick Steinhardt, Jun 6, 2024
  173. 24/27 builtin/rebase: do not assign default backend to non-constant fieldPatrick Steinhardt, Jun 6, 2024
  174. 25/27 builtin/rebase: always store allocated string in `options.strategy`Patrick Steinhardt, Jun 6, 2024
  175. 26/27 builtin/merge: always store allocated strings in `pull_twohead`Patrick Steinhardt, Jun 6, 2024
  176. 27/27 config.mak.dev: enable `-Wwrite-strings` warningPatrick Steinhardt, Jun 6, 2024
  177. 00/27 Compile with `-Wwrite-strings`Patrick Steinhardt, Jun 7, 2024
  178. 01/27 global: improve const correctness when assigning string constantsPatrick Steinhardt, Jun 7, 2024
  179. 02/27 global: convert intentionally-leaking config strings to constsPatrick Steinhardt, Jun 7, 2024
  180. 03/27 refs/reftable: stop micro-optimizing refname allocations on copyPatrick Steinhardt, Jun 7, 2024
  181. 04/27 reftable: cast away constness when assigning constants to recordsPatrick Steinhardt, Jun 7, 2024
  182. 05/27 refspec: remove global tag refspec structurePatrick Steinhardt, Jun 7, 2024
  183. 06/27 builtin/remote: cast away constness in `get_head_names()`Patrick Steinhardt, Jun 7, 2024
  184. 07/27 diff: cast string constant in `fill_textconv()`Patrick Steinhardt, Jun 7, 2024
  185. 08/27 line-log: stop assigning string constant to file parent bufferPatrick Steinhardt, Jun 7, 2024
  186. 09/27 line-log: always allocate the output prefixPatrick Steinhardt, Jun 7, 2024
  187. 10/27 entry: refactor how we remove items for delayed checkoutsPatrick Steinhardt, Jun 7, 2024
  188. 11/27 ident: add casts for fallback name and GECOSPatrick Steinhardt, Jun 7, 2024
  189. 12/27 object-file: mark cached object buffers as constPatrick Steinhardt, Jun 7, 2024
  190. 13/27 object-file: make `buf` parameter of `index_mem()` a constantPatrick Steinhardt, Jun 7, 2024
  191. 14/27 pretty: add casts for decoration option pointersPatrick Steinhardt, Jun 7, 2024
  192. 15/27 compat/win32: fix const-correctness with string constantsPatrick Steinhardt, Jun 7, 2024
  193. 16/27 http: do not assign string constant to non-const fieldPatrick Steinhardt, Jun 7, 2024
  194. 17/27 parse-options: cast long name for OPTION_ALIASPatrick Steinhardt, Jun 7, 2024
  195. 18/27 send-pack: always allocate receive statusPatrick Steinhardt, Jun 7, 2024
  196. 19/27 remote-curl: avoid assigning string constant to non-const variablePatrick Steinhardt, Jun 7, 2024
  197. 20/27 revision: always store allocated strings in output encodingPatrick Steinhardt, Jun 7, 2024
  198. 21/27 mailmap: always store allocated strings in mailmap blobPatrick Steinhardt, Jun 7, 2024
  199. 22/27 imap-send: drop global `imap_server_conf` variablePatrick Steinhardt, Jun 7, 2024
  200. 23/27 imap-send: fix leaking memory in `imap_server_conf`Patrick Steinhardt, Jun 7, 2024
  201. 24/27 builtin/rebase: do not assign default backend to non-constant fieldPatrick Steinhardt, Jun 7, 2024
  202. 25/27 builtin/rebase: always store allocated string in `options.strategy`Patrick Steinhardt, Jun 7, 2024
  203. 26/27 builtin/merge: always store allocated strings in `pull_twohead`Patrick Steinhardt, Jun 7, 2024
  204. 27/27 config.mak.dev: enable `-Wwrite-strings` warningPatrick Steinhardt, Jun 7, 2024
  205. Junio C HamanoJun 7, 2024

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