3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sven Eckelmann <sven@xxxxxxxxxxxxx> commit b5a1eeef04cc7859f34dec9b72ea1b28e4aba07c upstream. 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@xxxxxxxxxxxxx> Signed-off-by: Marek Lindner <lindner_marek@xxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- net/batman-adv/icmp_socket.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- 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 fi 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) -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html