From a72c45f4ee33988ff2db4cba91b9daa75869e047 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Wed, 20 Jan 2021 09:28:02 +0100 Subject: [PATCH] media: v4l2-ctrls.c: fix shift-out-of-bounds in std_validate commit 048c96e28674f15c0403deba2104ffba64544a06 upstream. If a menu has more than 64 items, then don't check menu_skip_mask for items 65 and up. Signed-off-by: Hans Verkuil Reported-by: syzbot+42d8c7c3d3e594b34346@syzkaller.appspotmail.com Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/v4l2-core/v4l2-ctrls.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index cd84dbbf6a89..3fe99519fedf 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -1795,7 +1795,8 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx, case V4L2_CTRL_TYPE_INTEGER_MENU: if (ptr.p_s32[idx] < ctrl->minimum || ptr.p_s32[idx] > ctrl->maximum) return -ERANGE; - if (ctrl->menu_skip_mask & (1ULL << ptr.p_s32[idx])) + if (ptr.p_s32[idx] < BITS_PER_LONG_LONG && + (ctrl->menu_skip_mask & BIT_ULL(ptr.p_s32[idx]))) return -EINVAL; if (ctrl->type == V4L2_CTRL_TYPE_MENU && ctrl->qmenu[ptr.p_s32[idx]][0] == '\0')