[PATCH 3/3] Prevent send-pack from segfaulting when a branch doesn't match

["Shawn O. Pearce" <spearce@spearce.org>]

If `git push url foo` can't find a local branch named foo we can't
match it to any remote branch as the local branch is NULL and its
name is probably at position 0x34 in memory.  On most systems that
isn't a valid address for git-send-pack's virtual address space
and we segfault.

If we can't find a source match and we have no destination we
need to abort the match function early before we try to match the
destination against the remote.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 remote.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/remote.c b/remote.c
index 2166a2b..e7d735b 100644
--- a/remote.c
+++ b/remote.c
@@ -610,8 +610,11 @@ static int match_explicit(struct ref *src, struct ref *dst,
 	if (!matched_src)
 		errs = 1;
 
-	if (!dst_value)
+	if (!dst_value) {
+		if (!matched_src)
+			return errs;
 		dst_value = matched_src->name;
+	}
 
 	switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 	case 1:
-- 
1.5.3.2.124.g2456-dirty