[PATCH 10/13] remote.c: make match_refs() copy src ref before assigning to peer_ref
- From
Jay Soffian <jaysoffian@gmail.com>
- Date
- Feb 23, 2009, 06:28 UTC
- Message-ID
- <75e083170cea799499bf66792a1c3950b29d6021.1235368324.git.jaysoffian@gmail.com>
- In-Reply-To
- <cover.1235368324.git.jaysoffian@gmail.com>
In some instances, match_refs() was setting the peer_ref field in the dst ref list such that it pointed to a ref in the src list, instead of to a copy. This would cause a double-free when both the src and dst ref lists were freed, as free_refs() frees the peer_ref. A double-free would also occur if the same branch was pushed to two different destinations such as:
push = refs/heads/master:refs/heads/backup push = refs/heads/master:refs/heads/master
This patch corrects the problem by copying the ref when it has been plucked from the src list.
Signed-off-by: Jay Soffian <jaysoffian@gmail.com> --- remote.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/remote.c b/remote.c index 5cb443f..ab387f2 100644 --- a/remote.c +++ b/remote.c @@ -930,6 +930,7 @@ static int match_explicit(struct ref *src, struct ref *dst, struct refspec *rs) { struct ref *matched_src, *matched_dst; + int copy_src; const char *dst_value = rs->dst; char *dst_guess; @@ -940,6 +941,7 @@ static int match_explicit(struct ref *src, struct ref *dst, matched_src = matched_dst = NULL; switch (count_refspec_match(rs->src, src, &matched_src)) { case 1: + copy_src = 1; break; case 0: /* The source could be in the get_sha1() format @@ -949,6 +951,7 @@ static int match_explicit(struct ref *src, struct ref *dst, matched_src = try_explicit_object_name(rs->src); if (!matched_src) return error("src refspec %s does not match any.", rs->src); + copy_src = 0; break; default: return error("src refspec %s matches more than one.", rs->src); @@ -994,7 +997,7 @@ static int match_explicit(struct ref *src, struct ref *dst, return error("dst ref %s receives from more than one src.", matched_dst->name); else { - matched_dst->peer_ref = matched_src; + matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src; matched_dst->force = rs->force; } return 0; @@ -1102,7 +1105,7 @@ int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail, dst_peer = make_linked_ref(dst_name, dst_tail); hashcpy(dst_peer->new_sha1, src->new_sha1); } - dst_peer->peer_ref = src; + dst_peer->peer_ref = copy_ref(src); dst_peer->force = pat->force; free_name: free(dst_name);
-- 1.6.2.rc1.223.gfed32