1 files changed, 30 insertions, 7 deletions

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index ffc87851f2e8..82312df9b0bf 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1312,8 +1312,10 @@ static void sg_rq_end_io(struct request *rq, int uptodate)
                 wake_up_interruptible(&sfp->read_wait);
                 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
                 kref_put(&sfp->f_ref, sg_remove_sfp);
-        } else
-                execute_in_process_context(sg_rq_end_io_usercontext, &srp->ew);
+        } else {
+                INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
+                schedule_work(&srp->ew.work);
+        }
 }
 
 static struct file_operations sg_fops = {
@@ -1656,10 +1658,30 @@ static int sg_start_req(Sg_request *srp, unsigned char *cmd)
                 md->null_mapped = hp->dxferp ? 0 : 1;
         }
 
-        if (iov_count)
-                res = blk_rq_map_user_iov(q, rq, md, hp->dxferp, iov_count,
-                                          hp->dxfer_len, GFP_ATOMIC);
-        else
+        if (iov_count) {
+                int len, size = sizeof(struct sg_iovec) * iov_count;
+                struct iovec *iov;
+
+                iov = kmalloc(size, GFP_ATOMIC);
+                if (!iov)
+                        return -ENOMEM;
+
+                if (copy_from_user(iov, hp->dxferp, size)) {
+                        kfree(iov);
+                        return -EFAULT;
+                }
+
+                len = iov_length(iov, iov_count);
+                if (hp->dxfer_len < len) {
+                        iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
+                        len = hp->dxfer_len;
+                }
+
+                res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
+                                          iov_count,
+                                          len, GFP_ATOMIC);
+                kfree(iov);
+        } else
                 res = blk_rq_map_user(q, rq, md, hp->dxferp,
                                       hp->dxfer_len, GFP_ATOMIC);
 
@@ -2079,7 +2101,8 @@ static void sg_remove_sfp(struct kref *kref)
         write_unlock_irqrestore(&sg_index_lock, iflags);
         wake_up_interruptible(&sdp->o_excl_wait);
 
-        execute_in_process_context(sg_remove_sfp_usercontext, &sfp->ew);
+        INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
+        schedule_work(&sfp->ew.work);
 }
 
 static int