| From | Kamal Mostafa <> | Subject | [PATCH 3.8 102/166] ext2: Fix oops in ext2_get_block() called from ext2_quota_write() | Date | Wed, 15 Jan 2014 13:51:56 -0800 |
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3.8.13.16 -stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara <jack@suse.cz>
commit df4e7ac0bb70abc97fbfd9ef09671fc084b3f9db upstream.
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.
Reviewed-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Christoph Hellwig <hch@lst.de> Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- fs/ext2/super.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index fa04d02..9d8b0ad 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; -- 1.8.3.2
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