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| author | Zheyu Ma <zheyuma97@gmail.com> | 2022-08-04 20:41:24 +0800 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2022-08-05 18:44:15 +0200 |
| commit | 96b550971c65d54d64728d8ba973487878a06454 (patch) | |
| tree | 719bcf3c72ca14dd239e3d6eb7a2f9f3ad960514 /drivers/video/fbdev/sticore.h | |
| parent | ec0754c60217248fa77cc9005d66b2b55200ac06 (diff) | |
| download | linux-96b550971c65d54d64728d8ba973487878a06454.tar.bz2 | |
video: fbdev: arkfb: Check the size of screen before memset_io()
In the function arkfb_set_par(), the value of 'screen_size' is
calculated by the user input. If the user provides the improper value,
the value of 'screen_size' may larger than 'info->screen_size', which
may cause the following bug:
[ 659.399066] BUG: unable to handle page fault for address: ffffc90003000000
[ 659.399077] #PF: supervisor write access in kernel mode
[ 659.399079] #PF: error_code(0x0002) - not-present page
[ 659.399094] RIP: 0010:memset_orig+0x33/0xb0
[ 659.399116] Call Trace:
[ 659.399122] arkfb_set_par+0x143f/0x24c0
[ 659.399130] fb_set_var+0x604/0xeb0
[ 659.399161] do_fb_ioctl+0x234/0x670
[ 659.399189] fb_ioctl+0xdd/0x130
Fix the this by checking the value of 'screen_size' before memset_io().
Fixes: 681e14730c73 ("arkfb: new framebuffer driver for ARK Logic cards")
Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'drivers/video/fbdev/sticore.h')
0 files changed, 0 insertions, 0 deletions