If the v4l2_ctrl_g_ctrl*() or __v4l2_ctrl_s_ctrl*() functions are called for the wrong control type then they call WARN_ON since that is a driver error. But they still continue, potentially overwriting data. Change this to return an error (s_ctrl) or 0 (g_ctrl), just to be safe. Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> --- drivers/media/v4l2-core/v4l2-ctrls.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index 2928c5e0a73d..d3bacf6b59d6 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -3794,7 +3794,8 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl) struct v4l2_ext_control c; /* It's a driver bug if this happens. */ - WARN_ON(!ctrl->is_int); + if (WARN_ON(!ctrl->is_int)) + return 0; c.value = 0; get_ctrl(ctrl, &c); return c.value; @@ -3806,7 +3807,8 @@ s64 v4l2_ctrl_g_ctrl_int64(struct v4l2_ctrl *ctrl) struct v4l2_ext_control c; /* It's a driver bug if this happens. */ - WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64); + if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64)) + return 0; c.value64 = 0; get_ctrl(ctrl, &c); return c.value64; @@ -4215,7 +4217,8 @@ int __v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val) lockdep_assert_held(ctrl->handler->lock); /* It's a driver bug if this happens. */ - WARN_ON(!ctrl->is_int); + if (WARN_ON(!ctrl->is_int)) + return -EINVAL; ctrl->val = val; return set_ctrl(NULL, ctrl, 0); } @@ -4226,7 +4229,8 @@ int __v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val) lockdep_assert_held(ctrl->handler->lock); /* It's a driver bug if this happens. */ - WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64); + if (WARN_ON(ctrl->is_ptr || ctrl->type != V4L2_CTRL_TYPE_INTEGER64)) + return -EINVAL; *ctrl->p_new.p_s64 = val; return set_ctrl(NULL, ctrl, 0); } @@ -4237,7 +4241,8 @@ int __v4l2_ctrl_s_ctrl_string(struct v4l2_ctrl *ctrl, const char *s) lockdep_assert_held(ctrl->handler->lock); /* It's a driver bug if this happens. */ - WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING); + if (WARN_ON(ctrl->type != V4L2_CTRL_TYPE_STRING)) + return -EINVAL; strscpy(ctrl->p_new.p_char, s, ctrl->maximum + 1); return set_ctrl(NULL, ctrl, 0); } @@ -4249,7 +4254,8 @@ int __v4l2_ctrl_s_ctrl_area(struct v4l2_ctrl *ctrl, lockdep_assert_held(ctrl->handler->lock); /* It's a driver bug if this happens. */ - WARN_ON(ctrl->type != V4L2_CTRL_TYPE_AREA); + if (WARN_ON(ctrl->type != V4L2_CTRL_TYPE_AREA)) + return -EINVAL; *ctrl->p_new.p_area = *area; return set_ctrl(NULL, ctrl, 0); } -- 2.25.1
