From f12d67fe8c48998594d6f4391d64542a3752f04d Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 11 Apr 2018 11:47:32 -0400 Subject: [PATCH] media: v4l2-compat-ioctl32: prevent go past max size commit ea72fbf588ac9c017224dcdaa2019ff52ca56fee upstream. As warned by smatch: drivers/media/v4l2-core/v4l2-compat-ioctl32.c:879 put_v4l2_ext_controls32() warn: check for integer overflow 'count' The access_ok() logic should check for too big arrays too. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Ben Hutchings --- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index acf4dc31fb79..3b7997f85845 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -848,7 +848,7 @@ static int put_v4l2_ext_controls32(struct file *file, get_user(kcontrols, &kp->controls)) return -EFAULT; - if (!count) + if (!count || count > (U32_MAX/sizeof(*ucontrols))) return 0; if (get_user(p, &up->controls)) return -EFAULT;