xfs: don't send null bp to xfs_trans_brelse()
authorEric Sandeen <sandeen@sandeen.net>
Wed, 1 Oct 2014 23:23:49 +0000 (09:23 +1000)
committerDave Chinner <david@fromorbit.com>
Wed, 1 Oct 2014 23:23:49 +0000 (09:23 +1000)
commit6ee49a20c13b4b4e79a3bba406df8106cff284a1
tree07fd39c605fbfd6bb17fe348730d664b11c18fd2
parentce57bcf6b81caf1e9f780e98e8d23d3555746d74
xfs: don't send null bp to xfs_trans_brelse()

In this case, if bp is NULL, error is set, and we send a
NULL bp to xfs_trans_brelse, which will try to dereference it.

Test whether we actually have a buffer before we try to
free it.

Coverity spotted this.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
fs/xfs/libxfs/xfs_da_btree.c