[PATCH 10/13] remote.c: make match_refs() copy src ref before assigning to peer_ref

[Jay Soffian <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