sanity check in add_packed_git()

add_packed_git() tries to get the pack SHA1 by parsing its name.  It may
access uninitialized memory for packs with short names.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/sha1_file.c b/sha1_file.c
index fa22e9c..d83d824 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -464,7 +464,7 @@ struct packed_git *add_packed_git(char *path, int path_len, int local)
        p->pack_last_used = 0;
        p->pack_use_cnt = 0;
        p->pack_local = local;
-       if (!get_sha1_hex(path + path_len - 40 - 4, sha1))
+       if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
                memcpy(p->sha1, sha1, 20);
        return p;
 }