diff options
| author | Anirudh Rayabharam <[email protected]> | 2021-05-17 00:57:14 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2021-05-21 15:04:05 +0200 |
| commit | 02625c965239b71869326dd0461615f27307ecb3 (patch) | |
| tree | f977e43ab1a1e895b291a78284ddf65d24347a1c | |
| parent | d33ca7d2e8db435ae0e514877e83e07bbf283baa (diff) | |
video: hgafb: correctly handle card detect failure during probe
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/
Fixes: dc13cac4862c ("video: hgafb: fix potential NULL pointer dereference")
Cc: stable <[email protected]>
Reported-by: kernel test robot <[email protected]>
Reviewed-by: Igor Matheus Andrade Torrente <[email protected]>
Signed-off-by: Anirudh Rayabharam <[email protected]>
Signed-off-by: Dan Carpenter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
| -rw-r--r-- | drivers/video/fbdev/hgafb.c | 2 |
1 files changed, 1 insertions, 1 deletions
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", |