From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 16 Dec 2007 03:21:31 +0000 (-0500)
Subject: blkid: Avoid division by zero error when probing an invalid FAT filesystem
X-Git-Tag: v1.40.4~27
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=20c10a766788d9271e36f3ba3b0682a3027cb272;p=thirdparty%2Fe2fsprogs.git

blkid: Avoid division by zero error when probing an invalid FAT filesystem

Addresses-Sourceforge-Bug: #1831627

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/lib/blkid/probe.c b/lib/blkid/probe.c
index a188d8270..4c72a562e 100644
--- a/lib/blkid/probe.c
+++ b/lib/blkid/probe.c
@@ -284,6 +284,8 @@ static int probe_fat(struct blkid_probe *probe,
 			(sector_size-1)) / sector_size;
 
 	cluster_count = sect_count - (reserved + fat_size + dir_size);
+	if (ms->ms_cluster_size == 0)
+		return 1;
 	cluster_count /= ms->ms_cluster_size;
 
 	if (cluster_count > FAT32_MAX)