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| author | Tony Battersby <tonyb@cybernetics.com> | 2014-08-22 15:53:35 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-08-22 15:04:33 -0500 |
| commit | 2ba136daa3ae1e881c9f586f283fcaa164767dce (patch) | |
| tree | e10d432b6e8fe38d768aa3f9ba3c136ff9756ad7 | |
| parent | 6f4a16266fb3e58cd3e200eab51d2220ef92d604 (diff) | |
| download | lwn-2ba136daa3ae1e881c9f586f283fcaa164767dce.tar.gz lwn-2ba136daa3ae1e881c9f586f283fcaa164767dce.zip | |
fix regression in SCSI_IOCTL_SEND_COMMAND
blk_rq_set_block_pc() memsets rq->cmd to 0, so it should come
immediately after blk_get_request() to avoid overwriting the
user-supplied CDB. Also check for failure to allocate rq.
Fixes: f27b087b81b7 ("block: add blk_rq_set_block_pc()")
Cc: <stable@vger.kernel.org> # 3.16.x
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/scsi_ioctl.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 1d78e6cf9d61..5dd477bfb4bc 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -456,6 +456,11 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, } rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT); + if (!rq) { + err = -ENOMEM; + goto error; + } + blk_rq_set_block_pc(rq); cmdlen = COMMAND_SIZE(opcode); @@ -509,7 +514,6 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, memset(sense, 0, sizeof(sense)); rq->sense = sense; rq->sense_len = 0; - blk_rq_set_block_pc(rq); blk_execute_rq(q, disk, rq, 0); @@ -529,7 +533,8 @@ out: error: kfree(buffer); - blk_put_request(rq); + if (rq) + blk_put_request(rq); return err; } EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |