sg: fix unkillable I/O wait deadlock with scsi-mq

When using the write()/read() interface for submitting commands, the
SCSI generic driver does not call blk_put_request() on a completed SCSI
command until userspace calls read() to get the command completion.
Since scsi-mq uses a fixed number of preallocated requests, this makes
it possible for userspace to exhaust the entire preallocated supply of
requests.  For places in the kernel that call blk_get_request() with
GFP_KERNEL, this can cause the calling process to deadlock in a
permanent unkillable I/O wait in blk_get_request() -> ... -> bt_get().
For places in the kernel that call blk_get_request() with GFP_ATOMIC,
this can cause blk_get_request() always to return -EWOULDBLOCK.  Note
that these problems happen only if scsi-mq is enabled.  Prevent the
problems by calling blk_put_request() as soon as the SCSI command
completes instead of waiting for userspace to call read().

Cc: <stable@vger.kernel.org> # 3.17+
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 6ad1480e87b7..208bf3c8a16c 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1335,6 +1335,17 @@ sg_rq_end_io(struct request *rq, int uptodate)
         }
         /* Rely on write phase to clean out srp status values, so no "else" */
 
+        /*
+         * Free the request as soon as it is complete so that its resources
+         * can be reused without waiting for userspace to read() the
+         * result.  But keep the associated bio (if any) around until
+         * blk_rq_unmap_user() can be called from user context.
+         */
+        srp->rq = NULL;
+        if (rq->cmd != rq->__cmd)
+                kfree(rq->cmd);
+        __blk_put_request(rq->q, rq);
+
         write_lock_irqsave(&sfp->rq_list_lock, iflags);
         if (unlikely(srp->orphan)) {
                 if (sfp->keep_orphan)
@@ -1762,10 +1773,10 @@ sg_finish_rem_req(Sg_request *srp)
         SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
                                       "sg_finish_rem_req: res_used=%d\n",
                                       (int) srp->res_used));
-        if (srp->rq) {
-                if (srp->bio)
-                        ret = blk_rq_unmap_user(srp->bio);
+        if (srp->bio)
+                ret = blk_rq_unmap_user(srp->bio);
 
+        if (srp->rq) {
                 if (srp->rq->cmd != srp->rq->__cmd)
                         kfree(srp->rq->cmd);
                 blk_put_request(srp->rq);