From 237ce2e681d20e92fe17fc23a348b4f0d595e641 Mon Sep 17 00:00:00 2001
From: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Date: Sun, 16 Feb 2020 22:36:24 +0100
Subject: 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 <sjoerd.simons@collabora.co.uk>
Acked-By: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
---
 arch/um/drivers/vector_kern.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'arch/um')

diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
index 9693dfca7651..8e8aac1d30e1 100644
--- 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) {
-- 
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