sha1_file: release delta_stack on error in unpack_entry()

When unpack_entry() encounters a broken packed object, it returns early.
It adjusts the reference count of the pack window, but leaks the buffer
for a big delta stack in case the small automatic one was not enough.
Jump to the cleanup code at end instead, which takes care of that.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/sha1_file.c b/sha1_file.c
index d77b915db6..ba282c06bd 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2462,8 +2462,8 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
 				error("bad packed object CRC for %s",
 				      sha1_to_hex(sha1));
 				mark_bad_packed_object(p, sha1);
-				unuse_pack(&w_curs);
-				return NULL;
+				data = NULL;
+				goto out;
 			}
 		}
 
@@ -2599,6 +2599,7 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
 	*final_type = type;
 	*final_size = size;
 
+out:
 	unuse_pack(&w_curs);
 
 	if (delta_stack != small_delta_stack)