3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Kara <j...@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" <ty...@mit.edu>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Reported-by: Christoph Hellwig <h...@infradead.org>
Signed-off-by: Jan Kara <j...@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/ext2/super.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1493,6 +1493,7 @@ static ssize_t ext2_quota_write(struct s
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;
--
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