From: Haowen Bai <baihaowen@meizu.com>
Date: Fri, 1 Apr 2022 03:41:16 +0000 (+0800)
Subject: video: fbdev: sis: fix potential NULL dereference in sisfb_post_sis300()
X-Git-Tag: v5.18-rc5~35^2~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d1d608ce78b3fc330938faaa1f70a91cf20c03a9;p=thirdparty%2Flinux.git

video: fbdev: sis: fix potential NULL dereference in sisfb_post_sis300()

Do no access bios[] if it's NULL.

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/drivers/video/fbdev/sis/sis_main.c b/drivers/video/fbdev/sis/sis_main.c
index 742f62986b80b..f28fd69d5eb75 100644
--- a/drivers/video/fbdev/sis/sis_main.c
+++ b/drivers/video/fbdev/sis/sis_main.c
@@ -4463,7 +4463,7 @@ static void sisfb_post_sis300(struct pci_dev *pdev)
 		SiS_SetReg(SISCR, 0x37, 0x02);
 		SiS_SetReg(SISPART2, 0x00, 0x1c);
 		v4 = 0x00; v5 = 0x00; v6 = 0x10;
-		if(ivideo->SiS_Pr.UseROM) {
+		if (ivideo->SiS_Pr.UseROM && bios) {
 			v4 = bios[0xf5];
 			v5 = bios[0xf6];
 			v6 = bios[0xf7];