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media: v4l2-ctrls.c: fix shift-out-of-bounds in std_validate 

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 <hverkuil-cisco@xs4all.nl>
Reported-by: syzbot+42d8c7c3d3e594b34346@syzkaller.appspotmail.com
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2021-01-20 09:28:02 +01:00 committed by Mauro Carvalho Chehab
parent 036bf04f14
commit 048c96e286
1 changed files with 2 additions and 1 deletions
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3
drivers/media/v4l2-core/v4l2-ctrls.c
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@ -2181,7 +2181,8 @@ 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')