From: Paul Kot <pawlkt@gmail.com>
Date: Sat, 10 Dec 2011 14:28:34 +0000 (+0100)
Subject: batman-adv: bat_socket_read missing checks
X-Git-Tag: firefly_0821_release~3680^2~3834^2~250^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c00b6856fc642b234895cfabd15b289e76726430;p=firefly-linux-kernel-4.4.55.git

batman-adv: bat_socket_read missing checks

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>
---

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index defd6929ceae..88ab26f5f726 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -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);