batman-adv: bat_socket_read missing checks
authorPaul Kot <pawlkt@gmail.com>
Sat, 10 Dec 2011 14:28:34 +0000 (15:28 +0100)
committerMarek Lindner <lindner_marek@yahoo.de>
Mon, 12 Dec 2011 11:11:06 +0000 (19:11 +0800)
Writing a icmp_packet_rr and then reading icmp_packet can lead to kernel
memory corruption, if __user *buf is just below TASK_SIZE.

Signed-off-by: Paul Kot <pawlkt@gmail.com>
[sven@narfation.org: made it checkpatch clean]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
net/batman-adv/icmp_socket.c

index defd6929ceae51a621b8d04288c053611a377b87..88ab26f5f7269a347421957cec4552f22396ac73 100644 (file)
@@ -136,8 +136,8 @@ static ssize_t bat_socket_read(struct file *file, char __user *buf,
 
        spin_unlock_bh(&socket_client->lock);
 
-       error = __copy_to_user(buf, &socket_packet->icmp_packet,
-                              socket_packet->icmp_len);
+       error = copy_to_user(buf, &socket_packet->icmp_packet,
+                            socket_packet->icmp_len);
 
        packet_len = socket_packet->icmp_len;
        kfree(socket_packet);