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Message-Id: <20171218152743.142149104@linuxfoundation.org> Date: Mon, 18 Dec 2017 16:48:24 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>, Geert Uytterhoeven <geert@...ux-m68k.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>, Sasha Levin <alexander.levin@...izon.com> Subject: [PATCH 3.18 38/69] fbdev: controlfb: Add missing modes to fix out of bounds access 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Geert Uytterhoeven <geert@...ux-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=v2.5.2&id=29f279c764808560eaceb88fef36cbc35c529aad Augment control_mac_modes[] with the two new video modes to fix this. Reported-by: Dan Carpenter <dan.carpenter@...cle.com> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org> Cc: Dan Carpenter <dan.carpenter@...cle.com> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 */ };
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