net: llc: use correct size for sysctl timeout entries

commit 6b8d9117ccb4f81b1244aafa7bc70ef8fa45fc49 upstream.

The timeout entries are sizeof(int) rather than sizeof(long), which
means that when they were getting read we'd also leak kernel memory
to userspace along with the timeout values.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Moritz Muehlenhoff <jmm@inutil.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/net/llc/sysctl_net_llc.c b/net/llc/sysctl_net_llc.c
index 612a5ddaf93b1ab1b5a524c5efef8d6b1f769038..799bafc2af39ea191e3753c88c3f921e44a77162 100644 (file)
--- a/net/llc/sysctl_net_llc.c
+++ b/net/llc/sysctl_net_llc.c
@@ -18,28 +18,28 @@ static struct ctl_table llc2_timeout_table[] = {
        {
                .procname       = "ack",
                .data           = &sysctl_llc2_ack_timeout,
-               .maxlen         = sizeof(long),
+               .maxlen         = sizeof(sysctl_llc2_ack_timeout),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_jiffies,
        },
        {
                .procname       = "busy",
                .data           = &sysctl_llc2_busy_timeout,
-               .maxlen         = sizeof(long),
+               .maxlen         = sizeof(sysctl_llc2_busy_timeout),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_jiffies,
        },
        {
                .procname       = "p",
                .data           = &sysctl_llc2_p_timeout,
-               .maxlen         = sizeof(long),
+               .maxlen         = sizeof(sysctl_llc2_p_timeout),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_jiffies,
        },
        {
                .procname       = "rej",
                .data           = &sysctl_llc2_rej_timeout,
-               .maxlen         = sizeof(long),
+               .maxlen         = sizeof(sysctl_llc2_rej_timeout),
                .mode           = 0644,
                .proc_handler   = proc_dointvec_jiffies,
        },