OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

video: fbdev: fix OOB read in vga_8planes_imageblit()

Browse Source 
commit bd018a6a75 upstream.

syzbot is reporting OOB read at vga_8planes_imageblit() [1], for
"cdat[y] >> 4" can become a negative value due to "const char *cdat".

[1] https://syzkaller.appspot.com/bug?id=0d7a0da1557dcd1989e00cb3692b26d4173b4132

Reported-by: syzbot <syzbot+69fbd3e01470f169c8c4@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/90b55ec3-d5b0-3307-9f7c-7ff5c5fd6ad3@i-love.sakura.ne.jp
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tetsuo Handa 2020-08-31 19:37:00 +09:00 committed by Greg Kroah-Hartman
parent 9dd48c399a
commit 3aa4c49c8d
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/video/fbdev/vga16fb.c
View File

@ -1121,7 +1121,7 @@ static void vga_8planes_imageblit(struct fb_info *info, const struct fb_image *i
char oldop = setop(0); char oldop = setop(0);
char oldsr = setsr(0); char oldsr = setsr(0);
char oldmask = selectmask(); char oldmask = selectmask();
const char *cdat = image->data; const unsigned char *cdat = image->data;
u32 dx = image->dx; u32 dx = image->dx;
char __iomem *where; char __iomem *where;
int y; int y;