linux-ext4 - [PATCH 1/2] ext4: fix wrong assert in ext4_mb_normalize

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Date:	Mon,  3 Mar 2014 15:00:27 +0100
From:	Maurizio Lombardi <mlombard@...hat.com>
To:	linux-ext4@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, tytso@....edu,
	adilger.kernel@...ger.ca
Subject: [PATCH 1/2] ext4: fix wrong assert in ext4_mb_normalize_request()

the variable "size" is expressed as number of blocks and not as
number of clusters, this could trigger a kernel panic when using
ext4 with the size of a cluster different from the size of a block.

Signed-off-by: Maurizio Lombardi <mlombard@...hat.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 04a5c75..08ddfda 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3135,7 +3135,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
 	}
 	BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
 			start > ac->ac_o_ex.fe_logical);
-	BUG_ON(size <= 0 || size > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
+	BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
 
 	/* now prepare goal request */
 
-- 
Maurizio Lombardi

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