Re: [PATCH] video: hgafb: correctly handle card detect failure during probe
From: Anirudh Rayabharam <hidden>
Date: 2021-05-20 13:42:02
Also in:
dri-devel, linux-kernel-mentees, lkml, stable
On Mon, May 17, 2021 at 12:57:14AM +0530, Anirudh Rayabharam wrote:
The return value of hga_card_detect() is not properly handled causing the probe to succeed even though hga_card_detect() failed. Since probe succeeds, hgafb_open() can be called which will end up operating on an unmapped hga_vram. This results in an out-of-bounds access as reported by kernel test robot [1]. To fix this, correctly detect failure of hga_card_detect() by checking for a non-zero error code. [1]: https://lore.kernel.org/lkml/20210516150019.GB25903@xsang-OptiPlex-9020/ (local) Reported-by: kernel test robot <redacted> Fixes: dc13cac4862c ("video: hgafb: fix potential NULL pointer dereference")
Greg, this is one of the UMN fixes we did. So, do you want to take this patch into your tree? thanks! - Anirudh.
quoted hunk ↗ jump to hunk
Cc: stable <redacted> Signed-off-by: Anirudh Rayabharam <redacted> --- drivers/video/fbdev/hgafb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/drivers/video/fbdev/hgafb.c b/drivers/video/fbdev/hgafb.c index cc8e62ae93f6..bd3d07aa4f0e 100644 --- a/drivers/video/fbdev/hgafb.c +++ b/drivers/video/fbdev/hgafb.c@@ -558,7 +558,7 @@ static int hgafb_probe(struct platform_device *pdev) int ret; ret = hga_card_detect(); - if (!ret) + if (ret) return ret; printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",-- 2.26.2