gfs2: Add missing else in trans_add_meta/data
authorBob Peterson <rpeterso@redhat.com>
Thu, 1 Oct 2015 16:47:31 +0000 (11:47 -0500)
committerBob Peterson <rpeterso@redhat.com>
Thu, 1 Oct 2015 17:00:59 +0000 (12:00 -0500)
commit491e94f790982bec5a1334dd3db2708de3724bdf
tree710667725821e752d23d6bb1b829bbe6cee0b958
parent6de20eb0dee4c802d9d228d6c08d00386e172e52
gfs2: Add missing else in trans_add_meta/data

This patch fixes a timing window that causes a segfault.
The problem is that bd can remain NULL throughout the function
and then reference that NULL pointer if the bh->b_private starts
out NULL, then someone sets it to non-NULL inside the locking.
In that case, bd still needs to be set.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
fs/gfs2/trans.c