From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Battersby Subject: [PATCH] scsi: Fix more error handling in SCSI_IOCTL_SEND_COMMAND Date: Mon, 10 Nov 2014 17:40:02 -0500 Message-ID: <54613EC2.8010304@cybernetics.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-scsi@vger.kernel.org, "James E.J. Bottomley" , Jens Axboe Cc: linux-kernel@vger.kernel.org List-Id: linux-scsi@vger.kernel.org Fix an error path in SCSI_IOCTL_SEND_COMMAND that calls blk_put_request(rq) on an invalid IS_ERR(rq) pointer. Fixes: a492f075450f ("block,scsi: fixup blk_get_request dead queue scenarios") Signed-off-by: Tony Battersby --- (resending, since no one picked it up last time) For inclusion in 3.18 only. This fixes a problem introduced in 3.18. Note: this fixes a *different* problem from Jan Kara's patch with a similar subject line, which has already been applied to mainline. --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -458,7 +458,7 @@ 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 (IS_ERR(rq)) { err = PTR_ERR(rq); - goto error; + goto error_free_buffer; } blk_rq_set_block_pc(rq); @@ -531,9 +531,11 @@ out: } error: + blk_put_request(rq); + +error_free_buffer: kfree(buffer); - if (rq) - blk_put_request(rq); + return err; } EXPORT_SYMBOL_GPL(sg_scsi_ioctl);