[PATCH v2 1/1] maintenance: fix two memory leaks
- From
Lénaïc Huard <lenaic@lhuard.fr>
- Date
- May 10, 2021, 19:59 UTC
- Message-ID
- <20210510195909.621534-2-lenaic@lhuard.fr>
- In-Reply-To
- <20210510195909.621534-1-lenaic@lhuard.fr>
Fixes two memory leaks when running `git maintenance start` or `git maintenance stop` in `update_background_schedule`:
$ valgrind --leak-check=full ~/git/bin/git maintenance start ==76584== Memcheck, a memory error detector ==76584== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==76584== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info ==76584== Command: /home/lenaic/git/bin/git maintenance start ==76584== ==76584== ==76584== HEAP SUMMARY: ==76584== in use at exit: 34,880 bytes in 252 blocks ==76584== total heap usage: 820 allocs, 568 frees, 146,414 bytes allocated ==76584== ==76584== 65 bytes in 1 blocks are definitely lost in loss record 17 of 39 ==76584== at 0x483E6AF: malloc (vg_replace_malloc.c:306) ==76584== by 0x3DC39C: xrealloc (wrapper.c:126) ==76584== by 0x3992CC: strbuf_grow (strbuf.c:98) ==76584== by 0x39A473: strbuf_vaddf (strbuf.c:392) ==76584== by 0x39BC54: xstrvfmt (strbuf.c:979) ==76584== by 0x39BD2C: xstrfmt (strbuf.c:989) ==76584== by 0x18451B: update_background_schedule (gc.c:1977) ==76584== by 0x1846F6: maintenance_start (gc.c:2011) ==76584== by 0x1847B4: cmd_maintenance (gc.c:2030) ==76584== by 0x127A2E: run_builtin (git.c:453) ==76584== by 0x127E81: handle_builtin (git.c:704) ==76584== by 0x128142: run_argv (git.c:771) ==76584== ==76584== 240 bytes in 1 blocks are definitely lost in loss record 29 of 39 ==76584== at 0x4840D7B: realloc (vg_replace_malloc.c:834) ==76584== by 0x491CE5D: getdelim (in /usr/lib/libc-2.33.so) ==76584== by 0x39ADD7: strbuf_getwholeline (strbuf.c:635) ==76584== by 0x39AF31: strbuf_getdelim (strbuf.c:706) ==76584== by 0x39B064: strbuf_getline_lf (strbuf.c:727) ==76584== by 0x184273: crontab_update_schedule (gc.c:1919) ==76584== by 0x184678: update_background_schedule (gc.c:1997) ==76584== by 0x1846F6: maintenance_start (gc.c:2011) ==76584== by 0x1847B4: cmd_maintenance (gc.c:2030) ==76584== by 0x127A2E: run_builtin (git.c:453) ==76584== by 0x127E81: handle_builtin (git.c:704) ==76584== by 0x128142: run_argv (git.c:771) ==76584== ==76584== LEAK SUMMARY: ==76584== definitely lost: 305 bytes in 2 blocks ==76584== indirectly lost: 0 bytes in 0 blocks ==76584== possibly lost: 0 bytes in 0 blocks ==76584== still reachable: 34,575 bytes in 250 blocks ==76584== suppressed: 0 bytes in 0 blocks ==76584== Reachable blocks (those to which a pointer was found) are not shown. ==76584== To see them, rerun with: --leak-check=full --show-leak-kinds=all ==76584== ==76584== For lists of detected and suppressed errors, rerun with: -s ==76584== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Signed-off-by: Lénaïc Huard <lenaic@lhuard.fr> --- builtin/gc.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/builtin/gc.c b/builtin/gc.c index ef7226d7bc..484fe983d3 100644 --- a/builtin/gc.c +++ b/builtin/gc.c @@ -1924,6 +1924,7 @@ static int crontab_update_schedule(int run_maintenance, int fd, const char *cmd) else if (!in_old_region) fprintf(cron_in, "%s\n", line.buf); } + strbuf_release(&line); if (run_maintenance) { struct strbuf line_format = STRBUF_INIT; @@ -1986,8 +1987,10 @@ static int update_background_schedule(int enable) cmd = sep + 1; } - if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) - return error(_("another process is scheduling background maintenance")); + if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) { + result = error(_("another process is scheduling background maintenance")); + goto cleanup; + } if (!strcmp(scheduler, "launchctl")) result = launchctl_update_schedule(enable, get_lock_file_fd(&lk), cmd); @@ -1999,6 +2002,9 @@ static int update_background_schedule(int enable) die("unknown background scheduler: %s", scheduler); rollback_lock_file(&lk); + +cleanup: + free(lock_path); free(testing); return result; }
-- 2.31.1