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builtin/submodule--helper: release unused strbuf to avoid leak 

relative_url() populates sb. In the normal return path, its buffer is
detached using strbuf_detach(). However the early return path does
nothing with sb, which means that sb's memory is leaked - therefore
we add a release to avoid this leak.

The reset is also only necessary for the normal return path, hence we
move it down to after the early-return to avoid unnecessary work.

LSAN output from t0060:

Direct leak of 121 byte(s) in 1 object(s) allocated from:
    #0 0x7f31246f28b0 in realloc (/usr/lib64/libasan.so.4+0xdc8b0)
    #1 0x98d7d6 in xrealloc wrapper.c:126
    #2 0x909a60 in strbuf_grow strbuf.c:98
    #3 0x90bf00 in strbuf_vaddf strbuf.c:401
    #4 0x90c321 in strbuf_addf strbuf.c:335
    #5 0x5cb78d in relative_url builtin/submodule--helper.c:182
    #6 0x5cbe46 in resolve_relative_url_test builtin/submodule--helper.c:248
    #7 0x410dcd in run_builtin git.c:475
    #8 0x410dcd in handle_builtin git.c:729
    #9 0x414087 in run_argv git.c:818
    #10 0x414087 in cmd_main git.c:949
    #11 0x40e9ec in main common-main.c:52
    #12 0x7f3123c41349 in __libc_start_main (/lib64/libc.so.6+0x24349)

SUMMARY: AddressSanitizer: 121 byte(s) leaked in 1 allocation(s).

Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Andrzej Hunt 2021-07-25 15:08:21 +02:00 committed by Junio C Hamano
parent 14c3dd817d
commit edfc744918
1 changed files with 4 additions and 2 deletions
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6
builtin/submodule--helper.c
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@ -187,11 +187,13 @@ static char *relative_url(const char *remote_url,
out = xstrdup(sb.buf + 2);
else
out = xstrdup(sb.buf);
strbuf_reset(&sb);
if (!up_path || !is_relative)
if (!up_path || !is_relative) {
strbuf_release(&sb);
return out;
}
strbuf_reset(&sb);
strbuf_addf(&sb, "%s%s", up_path, out);
free(out);
return strbuf_detach(&sb, NULL);