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author | Elijah Newren <newren@gmail.com> | 2022-02-20 01:29:50 +0000 |
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committer | Junio C Hamano <gitster@pobox.com> | 2022-02-20 00:03:29 -0800 |
commit | 8d60e9d2010d34f8c8ca65967ed02a2b06d74dc5 (patch) | |
tree | 91fc2f69b007bf5a3d927745e5cabd0db358b09e /t/helper/test-sha1.c | |
parent | The sixth batch (diff) | |
download | tgif-8d60e9d2010d34f8c8ca65967ed02a2b06d74dc5.tar.xz |
merge-ort: fix small memory leak in detect_and_process_renames()
detect_and_process_renames() detects renames on both sides of history
and then combines these into a single diff_queue_struct. The combined
diff_queue_struct needs to be able to hold the renames found on either
side, and since it knows the (maximum) size it needs, it pre-emptively
grows the array to the appropriate size:
ALLOC_GROW(combined.queue,
renames->pairs[1].nr + renames->pairs[2].nr,
combined.alloc);
It then collects the items from each side:
collect_renames(opt, &combined, MERGE_SIDE1, ...)
collect_renames(opt, &combined, MERGE_SIDE2, ...)
Note, though, that collect_renames() sometimes determines that some
pairs are unnecessary and does not include them in the combined array.
When it is done, detect_and_process_renames() frees this memory:
if (combined.nr) {
...
free(combined.queue);
}
The problem is that sometimes even when there are pairs, none of them
are necessary. Instead of checking combined.nr, just remove the
if-check; free() knows to skip NULL pointers. This change fixes the
following memory leak, as reported by valgrind:
==PID== 192 bytes in 1 blocks are definitely lost in loss record 107 of 134
==PID== at 0xADDRESS: malloc
==PID== by 0xADDRESS: realloc
==PID== by 0xADDRESS: xrealloc (wrapper.c:126)
==PID== by 0xADDRESS: detect_and_process_renames (merge-ort.c:3134)
==PID== by 0xADDRESS: merge_ort_nonrecursive_internal (merge-ort.c:4610)
==PID== by 0xADDRESS: merge_ort_internal (merge-ort.c:4709)
==PID== by 0xADDRESS: merge_incore_recursive (merge-ort.c:4760)
==PID== by 0xADDRESS: merge_ort_recursive (merge-ort-wrappers.c:57)
==PID== by 0xADDRESS: try_merge_strategy (merge.c:753)
==PID== by 0xADDRESS: cmd_merge (merge.c:1676)
==PID== by 0xADDRESS: run_builtin (git.c:461)
==PID== by 0xADDRESS: handle_builtin (git.c:713)
==PID== by 0xADDRESS: run_argv (git.c:780)
==PID== by 0xADDRESS: cmd_main (git.c:911)
==PID== by 0xADDRESS: main (common-main.c:52)
Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/helper/test-sha1.c')
0 files changed, 0 insertions, 0 deletions