1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 21225d62b0c1..1e82d4128a84 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -758,8 +758,11 @@ static bool sg_is_valid_dxfer(sg_io_hdr_t *hp)
                 if (hp->dxferp || hp->dxfer_len > 0)
                         return false;
                 return true;
-        case SG_DXFER_TO_DEV:
         case SG_DXFER_FROM_DEV:
+                if (hp->dxfer_len < 0)
+                        return false;
+                return true;
+        case SG_DXFER_TO_DEV:
         case SG_DXFER_TO_FROM_DEV:
                 if (!hp->dxferp || hp->dxfer_len == 0)
                         return false;