From: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Date: Tue, 15 Nov 2016 02:04:37 +0000 (-0500)
Subject: ext4: fix mballoc breakage with 64k block size
X-Git-Tag: v4.10-rc1~130^2~46
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=69e43e8cc971a79dd1ee5d4343d8e63f82725123;p=linux.git

ext4: fix mballoc breakage with 64k block size

'border' variable is set to a value of 2 times the block size of the
underlying filesystem. With 64k block size, the resulting value won't
fit into a 16-bit variable. Hence this commit changes the data type of
'border' to 'unsigned int'.

Fixes: c9de560ded61f
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@vger.kernel.org
---

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index f418f55c2bbe..a937ac7ef99f 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -669,7 +669,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
 	ext4_grpblk_t min;
 	ext4_grpblk_t max;
 	ext4_grpblk_t chunk;
-	unsigned short border;
+	unsigned int border;
 
 	BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb));