diff mbox series

[02/14] v4l2-ctrls.c: fix shift-out-of-bounds in std_validate

Message ID 20210120094306.784318-3-hverkuil-cisco@xs4all.nl
State Accepted
Commit 048c96e28674f15c0403deba2104ffba64544a06
Headers show
Series Fixes for smatch/sparse/sysbot/compiler warnings | expand

Commit Message

Hans Verkuil Jan. 20, 2021, 9:42 a.m. UTC 
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
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f7b310240af2..016cf6204cbb 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -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')