uvesafb/connector: Disallow unpliviged users to send netlink packets

(cherry picked from commit 30efa3f76813b17445bc5a2e443ae9731518566b)

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
index aa7cd959cced63736721afe1ad97689dced21d82..e35232a1857199926882234faf795e61cd755cc7 100644 (file)
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c
@@ -72,6 +72,9 @@ static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *ns
        struct uvesafb_task *utask;
        struct uvesafb_ktask *task;
 
+       if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN))
+               return;
+
        if (msg->seq >= UVESAFB_TASKS_MAX)
                return;