From: Xi Wang Date: Fri, 6 Apr 2012 12:32:37 +0000 (-0300) Subject: [media] v4l2-ctrls: fix integer overflow in try_set_ext_ctrls() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0a3475eb618321013dab9ac744201ed09e8061f9;p=openwrt%2Fstaging%2Fblogic.git [media] v4l2-ctrls: fix integer overflow in try_set_ext_ctrls() A large cs->count from userspace may overflow the allocation size, leading to memory corruption. try_set_ext_ctrls() can be reached from subdev_do_ioctl() or __video_do_ioctl(). Use kmalloc_array() to avoid the overflow. Signed-off-by: Xi Wang Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c index bf62b105b49d..1a71aa5fd458 100644 --- a/drivers/media/video/v4l2-ctrls.c +++ b/drivers/media/video/v4l2-ctrls.c @@ -2259,7 +2259,8 @@ static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, return class_check(hdl, cs->ctrl_class); if (cs->count > ARRAY_SIZE(helper)) { - helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL); + helpers = kmalloc_array(cs->count, sizeof(helper[0]), + GFP_KERNEL); if (!helpers) return -ENOMEM; }