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authorSven Eckelmann <sven@narfation.org>2011-12-10 15:28:36 +0100
committerMarek Lindner <lindner_marek@yahoo.de>2011-12-12 19:11:07 +0800
commitb5a1eeef04cc7859f34dec9b72ea1b28e4aba07c (patch)
tree4503055d16bbf2b05eac3adc6d04402bab8eba36 /net/batman-adv
parentd18eb45332478f319e5cf996e093228a68864cce (diff)
batman-adv: Only write requested number of byte to user buffer
Don't write more than the requested number of bytes of an batman-adv icmp packet to the userspace buffer. Otherwise unrelated userspace memory might get overridden by the kernel. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/icmp_socket.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 3b04fff3ede3..d9c1e7bb7fbf 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -136,10 +136,9 @@ 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);
+ packet_len = min(count, socket_packet->icmp_len);
+ error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
- packet_len = socket_packet->icmp_len;
kfree(socket_packet);
if (error)