# [PATCH] fast-import: zero all of 'struct tag' to silence valgrind 1 messages from 2012-03-05 to 2012-03-05. Participants: Thomas Rast. Thread: https://gitlist.dev/t/29835 ## Thomas Rast, 2012-03-05 13:48 Subject: [PATCH] fast-import: zero all of 'struct tag' to silence valgrind Message-ID: URL: https://gitlist.dev/e/f95bf5b4fb814e9c83df96604526dd48d13f1abc.1330955283.git.trast%40student.ethz.ch ``` When running t9300, valgrind (correctly) complains about an uninitialized value in write_crash_report: ==2971== Use of uninitialised value of size 8 ==2971== at 0x4164F4: sha1_to_hex (hex.c:70) ==2971== by 0x4073E4: die_nicely (fast-import.c:468) ==2971== by 0x43284C: die (usage.c:86) ==2971== by 0x40420D: main (fast-import.c:2731) ==2971== Uninitialised value was created by a heap allocation ==2971== at 0x4C29B3D: malloc (vg_replace_malloc.c:263) ==2971== by 0x433645: xmalloc (wrapper.c:35) ==2971== by 0x405DF5: pool_alloc (fast-import.c:619) ==2971== by 0x407755: pool_calloc.constprop.14 (fast-import.c:634) ==2971== by 0x403F33: main (fast-import.c:3324) Fix this by zeroing all of the 'struct tag'. We would only need to zero out the 'sha1' field, but this way seems more future-proof. Signed-off-by: Thomas Rast --- fast-import.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fast-import.c b/fast-import.c index 6cd19e5..c1486ca 100644 --- a/fast-import.c +++ b/fast-import.c @@ -2712,7 +2712,7 @@ static void parse_new_tag(void) /* Obtain the new tag name from the rest of our command */ sp = strchr(command_buf.buf, ' ') + 1; t = pool_alloc(sizeof(struct tag)); - t->next_tag = NULL; + memset(t, 0, sizeof(struct tag)); t->name = pool_strdup(sp); if (last_tag) last_tag->next_tag = t; -- 1.7.9.2.467.g7fee4 ```