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| author | Joe Lawrence <joe.lawrence@stratus.com> | 2014-07-02 21:35:16 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-08-26 23:20:23 +0200 |
| commit | eb571eeade2598635f813b3284d02c13a380301e (patch) | |
| tree | 539842ad23a4eaae8c272278fd9fea389afa6b93 /drivers/block/paride | |
| parent | Linux 3.17-rc2 (diff) | |
| download | linux-eb571eeade2598635f813b3284d02c13a380301e.tar.xz linux-eb571eeade2598635f813b3284d02c13a380301e.zip | |
block,scsi: verify return pointer from blk_get_request
The blk-core dead queue checks introduce an error scenario to
blk_get_request that returns NULL if the request queue has been
shutdown. This affects the behavior for __GFP_WAIT callers, who should
verify the return value before dereferencing.
Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Acked-by: Jiri Kosina <jkosina@suse.cz> [for pktdvd]
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/paride')
| -rw-r--r-- | drivers/block/paride/pd.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c index fea7e76a00de..ca831f741d89 100644 --- a/drivers/block/paride/pd.c +++ b/drivers/block/paride/pd.c @@ -722,6 +722,8 @@ static int pd_special_command(struct pd_unit *disk, int err = 0; rq = blk_get_request(disk->gd->queue, READ, __GFP_WAIT); + if (!rq) + return -ENODEV; rq->cmd_type = REQ_TYPE_SPECIAL; rq->special = func; |