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| author | Anirudh Rayabharam <mail@anirudhrb.com> | 2021-05-17 00:57:14 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-26 11:27:34 +0200 |
| commit | e7a48689d1e5ac2071baae98df356972d01dbf5e (patch) | |
| tree | e8485ea5ef3c8ea6985d7d8884b112d5b1aeb845 | |
| parent | e6c40c7df14497169e00e1e776c4cdb19d7d6bc0 (diff) | |
| download | linux-stable-e7a48689d1e5ac2071baae98df356972d01dbf5e.tar.gz linux-stable-e7a48689d1e5ac2071baae98df356972d01dbf5e.tar.bz2 linux-stable-e7a48689d1e5ac2071baae98df356972d01dbf5e.zip | |
video: hgafb: correctly handle card detect failure during probe
commit 02625c965239b71869326dd0461615f27307ecb3 upstream.
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 <stable@vger.kernel.org>
Reported-by: kernel test robot <oliver.sang@intel.com>
Reviewed-by: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210516192714.25823-1-mail@anirudhrb.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 9d15abd7893d..46ac8bbb376d 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", |