mptfusion: don't allow negative bytes in kbuf_alloc_2_sgl()

There is a static checker warning here because "bytes" is controlled by the user and we cap the upper bound with min() but allow negatives. Negative bytes will result in some nasty warning messages but are not super harmful. Anyway, no one needs negative bytes so let's just check for it and return NULL.

index fc73937..02b5f69 100644
@@ -1038,6 +1038,10 @@ kbuf_alloc_2_sgl(int bytes, u32 sgdir, int sge_offset, int *frags,
 	int		 i, buflist_ent;
 	int		 sg_spill = MAX_FRAGS_SPILL1;
 	int		 dir;
+
+	if (bytes < 0)
+		return NULL;
+
 	/* initialization */
 	*frags = 0;
 	*blp = NULL;

Dan> There is a static checker warning here because "bytes" is Dan> controlled by the user and we cap the upper bound with min() but Dan> allow negatives. Negative bytes will result in some nasty warning Dan> messages but are not super harmful. Anyway, no one needs negative Dan> bytes so let's just check for it and return NULL.

Applied.

Martin K. Petersen	Oracle Linux Engineering