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authorLibravatar Elijah Newren <newren@gmail.com>2022-02-20 01:29:51 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2022-02-20 00:03:30 -0800
commit81afc7941294cec828daaff86c040b1edf099f25 (patch)
tree7bb3216fb193d034a6a4253c6e70f73a48b8ccb6 /t/t7002-mv-sparse-checkout.sh
parentmerge-ort: fix small memory leak in detect_and_process_renames() (diff)
downloadtgif-81afc7941294cec828daaff86c040b1edf099f25.tar.xz
merge-ort: fix small memory leak in unique_path()
The struct strmap paths member of merge_options_internal is perhaps the most central data structure to all of merge-ort. Because all the paths involved in the merge need to be kept until the merge is complete, this "paths" data structure traditionally took responsibility for owning all the allocated paths. When the merge is over, those paths were free()d as part of free()ing this strmap. In commit 6697ee01b5d3 (merge-ort: switch our strmaps over to using memory pools, 2021-07-30), we changed the allocations for pathnames to come from a memory pool. That meant the ownership changed slightly; there were no individual free() calls to make, instead the memory pool owned all those paths and they were free()d all at once. Unfortunately unique_path() was written presuming the pre-memory-pool model, and allocated a path on the heap and left it in the strmap for later free()ing. Modify it to return a path allocated from the memory pool instead. Note that there's one instance -- in record_conflicted_index_entries() -- where the returned string from unique_path() was only used very temporarily and thus had been immediately free()'d. This codepath was associated with an ugly skip-worktree workaround that has since been better fixed by the in-flight en/present-despite-skipped topic. This workaround probably makes sense to excise once that topic merges down, but for now, just remove the immediate free() and allow the returned string to be free()d when the memory pool is released. This fixes the following memory leak as reported by valgrind: ==PID== 65 bytes in 1 blocks are definitely lost in loss record 79 of 134 ==PID== at 0xADDRESS: malloc ==PID== by 0xADDRESS: realloc ==PID== by 0xADDRESS: xrealloc (wrapper.c:126) ==PID== by 0xADDRESS: strbuf_grow (strbuf.c:98) ==PID== by 0xADDRESS: strbuf_vaddf (strbuf.c:394) ==PID== by 0xADDRESS: strbuf_addf (strbuf.c:335) ==PID== by 0xADDRESS: unique_path (merge-ort.c:733) ==PID== by 0xADDRESS: process_entry (merge-ort.c:3678) ==PID== by 0xADDRESS: process_entries (merge-ort.c:4037) ==PID== by 0xADDRESS: merge_ort_nonrecursive_internal (merge-ort.c:4621) ==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) 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>
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