ext2: Zero our b_size in ext2_quota_read()

ext2_quota_read() doesn't initialize tmp_bh.b_size before calling
ext2_get_block() where we access it. Since it is a local variable it
might contain some garbage. Make sure it is filled with reasonable
value before passing.

Signed-off-by: Manish Katiyar <mkatiyar@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 7c6e3606f0ecd0d4c4efc64d262b0184b392deaa..f983225266dc7fa2066a5db6b0e929143f603ec1 100644 (file)
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1331,6 +1331,7 @@ static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
                                sb->s_blocksize - offset : toread;
 
                tmp_bh.b_state = 0;
+               tmp_bh.b_size = sb->s_blocksize;
                err = ext2_get_block(inode, blk, &tmp_bh, 0);
                if (err < 0)
                        return err;