linux-ext4 - [PATCH] ext4: ext4_mb_mark_free_simple: Fix integer value truncation

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Message-Id: <1478164472-28376-1-git-send-email-chandan@linux.vnet.ibm.com>
Date:   Thu,  3 Nov 2016 14:44:32 +0530
From:   Chandan Rajendra <chandan@...ux.vnet.ibm.com>
To:     linux-ext4@...r.kernel.org
Cc:     Chandan Rajendra <chandan@...ux.vnet.ibm.com>, tytso@....edu,
        jack@...e.cz, aneesh.kumar@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] ext4: ext4_mb_mark_free_simple: Fix integer value truncation

'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'.

Signed-off-by: Chandan Rajendra <chandan@...ux.vnet.ibm.com>
---
 fs/ext4/mballoc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index f418f55..a937ac7 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));
 
-- 
2.5.5

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