linux-ext4 - [PATCH] ext2: Fix oops in ext2_get_block() called from ext2_quota

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Message-Id: <1386071825-10915-1-git-send-email-jack@suse.cz>
Date:	Tue,  3 Dec 2013 12:57:05 +0100
From:	Jan Kara <jack@...e.cz>
To:	linux-ext4@...r.kernel.org
Cc:	Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH] ext2: Fix oops in ext2_get_block() called from ext2_quota_write()

ext2_quota_write() doesn't properly setup bh it passes to
ext2_get_block() and thus we hit assertion BUG_ON(maxblocks == 0) in
ext2_get_blocks() (or we could actually ask for mapping arbitrary number
of blocks depending on whatever value was on stack).

Fix ext2_quota_write() to properly fill in number of blocks to map.

Reported-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext2/super.c | 1 +
 1 file changed, 1 insertion(+)

  I plan to send this patch to Linus soon.

								Honza

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 288534920fe5..20d6697bd638 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1493,6 +1493,7 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
 				sb->s_blocksize - offset : towrite;
 
 		tmp_bh.b_state = 0;
+		tmp_bh.b_size = sb->s_blocksize;
 		err = ext2_get_block(inode, blk, &tmp_bh, 1);
 		if (err < 0)
 			goto out;
-- 
1.8.1.4

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