From: Heiko Voigt <hvoigt@hvoigt.net>
Date: Sat, 28 Jul 2012 15:46:36 +0000 (+0200)
Subject: link_alt_odb_entry: fix read over array bounds reported by valgrind
X-Git-Tag: v1.7.11.5~2^2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/cb2912c324477f0d92618ac258c43b2692e870c4?hp=--cc

link_alt_odb_entry: fix read over array bounds reported by valgrind

pfxlen can be longer than the path in objdir when relative_base
contains the path to gits object directory.  Here we are interested
in checking if ent->base[] (the part that corresponds to .git/objects)
is the same string as objdir, and the code NUL-terminated ent->base[]
to

LEADING PATH\0XX/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\0

in preparation for these "duplicate check" step (before we return
from the function, the first NUL is turned into '/' so that we can
fill XX when probing for loose objects).  All we need to do is to
compare the string with the path to our object directory.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

cb2912c324477f0d92618ac258c43b2692e870c4
diff --git a/sha1_file.c b/sha1_file.c
index 4f06a0e450..a1f3bee5ed 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -298,7 +298,7 @@ static int link_alt_odb_entry(const char * entry, int len, const char * relative
 			return -1;
 		}
 	}
-	if (!memcmp(ent->base, objdir, pfxlen)) {
+	if (!strcmp(ent->base, objdir)) {
 		free(ent);
 		return -1;
 	}