1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index dbe5b4b95df0..121de0aaa6ad 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1753,6 +1753,10 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
                         return res;
 
                 iov_iter_truncate(&i, hp->dxfer_len);
+                if (!iov_iter_count(&i)) {
+                        kfree(iov);
+                        return -EINVAL;
+                }
 
                 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
                 kfree(iov);