tree 3e00b7a00db585cf166899506d5fda04ab06a17e
parent 30bc9b53878a9921b02e3b5bc4283ac1c6de102a
author NeilBrown <neilb@suse.de> 1374644262 +1000
committer NeilBrown <neilb@suse.de> 1374734813 +1000

md/raid10: remove use-after-free bug.

We always need to be careful when calling generic_make_request, as it
can start a chain of events which might free something that we are
using.

Here is one place I wasn't careful enough.  If the wbio2 is not in
use, then it might get freed at the first generic_make_request call.
So perform all necessary tests first.

This bug was introduced in 3.3-rc3 (24afd80d99) and can cause an
oops, so fix is suitable for any -stable since then.

Cc: stable@vger.kernel.org (3.3+)
Signed-off-by: NeilBrown <neilb@suse.de>