linux-kernel - [PATCH AUTOSEL 5.4 21/40] media: v4l2-ctrls.c: fix shift-out-of-bounds in std

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Message-Id: <20210224125340.483162-21-sashal@kernel.org>
Date:   Wed, 24 Feb 2021 07:53:21 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        syzbot+42d8c7c3d3e594b34346@...kaller.appspotmail.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 21/40] media: v4l2-ctrls.c: fix shift-out-of-bounds in std_validate

From: Hans Verkuil <hverkuil-cisco@...all.nl>

[ Upstream commit 048c96e28674f15c0403deba2104ffba64544a06 ]

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@...all.nl>
Reported-by: syzbot+42d8c7c3d3e594b34346@...kaller.appspotmail.com
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 cd84dbbf6a890..3fe99519fedfb 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')
-- 
2.27.0