From: Vasily Gorbik <gor@linux.ibm.com>
Date: Mon, 19 Aug 2019 08:44:54 +0000 (+0200)
Subject: s390/vmcp: correct early_param handling
X-Git-Tag: v5.15~5531^2~23
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a45425d8a5a672d3322164cfce10b7b6fb32fcc2;p=platform%2Fkernel%2Flinux-starfive.git

s390/vmcp: correct early_param handling

Check "p" is not NULL before passing it to memparse, which doesn't
handle that case explicitly.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 0fa1b6b..9e06628 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -43,6 +43,8 @@ static struct cma *vmcp_cma;
 
 static int __init early_parse_vmcp_cma(char *p)
 {
+	if (!p)
+		return 1;
 	vmcp_cma_size = ALIGN(memparse(p, NULL), PAGE_SIZE);
 	return 0;
 }