4.14-stable review patch. If anyone has any objections, please let me know.
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From: Geert Uytterhoeven geert@linux-m68k.org
[ Upstream commit ac831a379d34109451b3c41a44a20ee10ecb615f ]
Dan's static analysis says:
drivers/video/fbdev/controlfb.c:560 control_setup() error: buffer overflow 'control_mac_modes' 20 <= 21
Indeed, control_mac_modes[] has only 20 elements, while VMODE_MAX is 22, which may lead to an out of bounds read when parsing vmode commandline options.
The bug was introduced in v2.4.5.6, when 2 new modes were added to macmodes.h, but control_mac_modes[] wasn't updated:
https://kernel.opensuse.org/cgit/kernel/diff/include/video/macmodes.h?h=v2.5...
Augment control_mac_modes[] with the two new video modes to fix this.
Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Geert Uytterhoeven geert@linux-m68k.org Cc: Dan Carpenter dan.carpenter@oracle.com Cc: Benjamin Herrenschmidt benh@kernel.crashing.org Signed-off-by: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/video/fbdev/controlfb.h | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/video/fbdev/controlfb.h +++ b/drivers/video/fbdev/controlfb.h @@ -141,5 +141,7 @@ static struct max_cmodes control_mac_mod {{ 1, 2}}, /* 1152x870, 75Hz */ {{ 0, 1}}, /* 1280x960, 75Hz */ {{ 0, 1}}, /* 1280x1024, 75Hz */ + {{ 1, 2}}, /* 1152x768, 60Hz */ + {{ 0, 1}}, /* 1600x1024, 60Hz */ };