[PATCH 09/11] batman-adv: bat_socket_read missing checks

[Marek Lindner <lindner_marek-LWAfsSFWpa4@public.gmane.org>]

From: Paul Kot <pawlkt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
[sven-KaDOiPu9UxWEi8DpZVb4nw@public.gmane.org: made it checkpatch clean]
Signed-off-by: Sven Eckelmann <sven-KaDOiPu9UxWEi8DpZVb4nw@public.gmane.org>
Signed-off-by: Marek Lindner <lindner_marek-LWAfsSFWpa4@public.gmane.org>
---
 net/batman-adv/icmp_socket.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index defd692..88ab26f 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);
-- 
1.7.5.4