From: Rostislav Skudnov <rostislav@tuxera.com>
Date: Thu, 11 Aug 2016 18:24:00 +0000 (+0000)
Subject: libblkid: Check that cluster size is nonzero when probing exFAT
X-Git-Tag: v2.29-rc1~117
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9d89a95e889f69aebf78f6d5ae38920026a8a94f;p=thirdparty%2Futil-linux.git

libblkid: Check that cluster size is nonzero when probing exFAT

This should prevent division by zero in find_label()

Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com>
---

diff --git a/libblkid/src/superblocks/exfat.c b/libblkid/src/superblocks/exfat.c
index 3f1e75c138..01ed30b788 100644
--- a/libblkid/src/superblocks/exfat.c
+++ b/libblkid/src/superblocks/exfat.c
@@ -114,7 +114,7 @@ static int probe_exfat(blkid_probe pr, const struct blkid_idmag *mag)
 	struct exfat_entry_label *label;
 
 	sb = blkid_probe_get_sb(pr, mag, struct exfat_super_block);
-	if (!sb)
+	if (!sb || !CLUSTER_SIZE(sb))
 		return errno ? -errno : BLKID_PROBE_NONE;
 
 	label = find_label(pr, sb);