um: vector: Avoid NULL ptr deference if transport is unset

When the transport option of a vec isn't set strncmp ends up being called on a NULL pointer. Better not do that. Signed-off-by: Sjoerd Simons <[email protected]> Acked-By: Anton Ivanov <[email protected]> Signed-off-by: Richard Weinberger <[email protected]>
umac211 · Mar 29, 2020 · 237ce2e · 237ce2e
1 parent 3363179
commit 237ce2e
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
@@ -197,6 +197,9 @@ static int get_transport_options(struct arglist *def)
 	long parsed;
 	int result = 0;
 
+	if (transport == NULL)
+		return -EINVAL;
+
 	if (vector != NULL) {
 		if (kstrtoul(vector, 10, &parsed) == 0) {
 			if (parsed == 0) {