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ref-filter: fix leak when formatting %(push:remoteref)

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When we expand the %(upstream) or %(push) placeholders, we rely on
remote.c's remote_ref_for_branch() to fill in the ":refname" argument.
But that function has confusing memory ownership semantics: it may or
may not return an allocated string, depending on whether we are in
"upstream" mode or "push" mode. The caller in ref-filter.c always
duplicates the result, meaning that we leak the original in the case of
%(push:refname).

To solve this, let's make the return value from remote_ref_for_branch()
consistent, by always returning an allocated pointer. Note that the
switch to returning a non-const pointer has a ripple effect inside the
function, too. We were storing the "dst" result as a const pointer, too,
even though it is always allocated! It is the return value from
apply_refspecs(), which is always a non-const allocated string.

And then on the caller side in ref-filter.c (and this is the only caller
at all), we just need to avoid the extra duplication when the return
value is non-NULL.

This clears up one case that LSan finds in t6300, but there are more.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2024-09-09 19:19:51 -04:00
committed by Junio C Hamano
parent ec007cde94
commit f046127b66
3 changed files with 6 additions and 6 deletions
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2
remote.h
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@ -329,7 +329,7 @@ struct branch {
struct branch *branch_get(const char *name);
const char *remote_for_branch(struct branch *branch, int *explicit);
const char *pushremote_for_branch(struct branch *branch, int *explicit);
const char *remote_ref_for_branch(struct branch *branch, int for_push);
char *remote_ref_for_branch(struct branch *branch, int for_push);
/* returns true if the given branch has merge configuration given. */
int branch_has_merge_config(struct branch *branch);