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| author | Bryn M. Reeves <bmr@redhat.com> | 2016-03-15 00:04:34 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-03-15 00:04:34 +0300 |
| commit | 98dbc9c6c61698792e3a66f32f3bf066201d42d7 (patch) | |
| tree | 7375ac9b9bf1bb3fdce3d34131d10f9ff059268e /drivers/md/dm.c | |
| parent | c3667cc6190469d2c7196c2d4dc75fcb33a0814f (diff) | |
| download | linux-98dbc9c6c61698792e3a66f32f3bf066201d42d7.tar.xz | |
dm: fix rq_end_stats() NULL pointer in dm_requeue_original_request()
An "old" (.request_fn) DM 'struct request' stores a pointer to the
associated 'struct dm_rq_target_io' in rq->special.
dm_requeue_original_request(), previously named
dm_requeue_unmapped_original_request(), called dm_unprep_request() to
reset rq->special to NULL. But rq_end_stats() would go on to hit a NULL
pointer deference because its call to tio_from_request() returned NULL.
Fix this by calling rq_end_stats() _before_ dm_unprep_request()
Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Fixes: e262f34741 ("dm stats: add support for request-based DM devices")
Cc: stable@vger.kernel.org # 4.2+
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 70d5b82a353a..be4905769a45 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1254,9 +1254,9 @@ static void dm_requeue_original_request(struct mapped_device *md, { int rw = rq_data_dir(rq); + rq_end_stats(md, rq); dm_unprep_request(rq); - rq_end_stats(md, rq); if (!rq->q->mq_ops) dm_old_requeue_request(rq); else |