* [PATCH] video: fbdev: sis: fix potential NULL dereference in sisfb_post_sis300()
@ 2022-04-01 3:41 Haowen Bai
2022-04-01 20:53 ` Helge Deller
0 siblings, 1 reply; 2+ messages in thread
From: Haowen Bai @ 2022-04-01 3:41 UTC (permalink / raw)
To: Thomas Winischhofer, Helge Deller
Cc: Haowen Bai, linux-fbdev, dri-devel, linux-kernel
bios could be null without checking null and return in this function,
but still dereference bios[0xf5].
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
---
drivers/video/fbdev/sis/sis_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/sis/sis_main.c b/drivers/video/fbdev/sis/sis_main.c
index 742f629..24a0299 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];
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] video: fbdev: sis: fix potential NULL dereference in sisfb_post_sis300()
2022-04-01 3:41 [PATCH] video: fbdev: sis: fix potential NULL dereference in sisfb_post_sis300() Haowen Bai
@ 2022-04-01 20:53 ` Helge Deller
0 siblings, 0 replies; 2+ messages in thread
From: Helge Deller @ 2022-04-01 20:53 UTC (permalink / raw)
To: Haowen Bai, Thomas Winischhofer; +Cc: linux-fbdev, dri-devel, linux-kernel
On 4/1/22 05:41, Haowen Bai wrote:
> bios could be null without checking null and return in this function,
> but still dereference bios[0xf5].
>
> Signed-off-by: Haowen Bai <baihaowen@meizu.com>
applied.
Thanks!
Helge
> ---
> drivers/video/fbdev/sis/sis_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/video/fbdev/sis/sis_main.c b/drivers/video/fbdev/sis/sis_main.c
> index 742f629..24a0299 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];
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-04-01 3:41 [PATCH] video: fbdev: sis: fix potential NULL dereference in sisfb_post_sis300() Haowen Bai
2022-04-01 20:53 ` Helge Deller
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