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From 5db86df6a849684fda6a7ee53978a1ba931848cb Mon Sep 17 00:00:00 2001
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Message-Id: <5db86df6a849684fda6a7ee53978a1ba931848cb.1491601565.git.davide.caratti@gmail.com>
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From: Davide Caratti <davide.caratti@gmail.com>
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Date: Fri, 24 Mar 2017 10:25:24 +0100
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Subject: [PATCH] macsec_linux: Fix NULL pointer dereference on error cases
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In case wpa_supplicant is using driver_macsec_linux, but macsec module
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is not (yet) loaded in the kernel, nl_socket_alloc() fails and drv->sk
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is NULL. In this case, don't call libnl functions rntl_link_add() or
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rtnl_link_change() using such NULL pointer, to prevent program from
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getting segmentation faults like:
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Program received signal SIGSEGV, Segmentation fault.
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nl_socket_get_local_port (sk=sk@entry=0x0) at socket.c:365
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365 if (sk->s_local.nl_pid == 0) {
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(gdb) p sk
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$1 = (const struct nl_sock *) 0x0
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(gdb) bt
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#0 nl_socket_get_local_port (sk=sk@entry=0x0) at socket.c:365
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#1 0x00007ffff79c56a0 in nl_complete_msg (sk=sk@entry=0x0,
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msg=msg@entry=0x55555595a1f0) at nl.c:491
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#2 0x00007ffff79c56d1 in nl_send_auto (sk=sk@entry=0x0,
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msg=msg@entry=0x55555595a1f0) at nl.c:522
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#3 0x00007ffff79c652f in nl_send_sync (sk=sk@entry=0x0,
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msg=0x55555595a1f0) at nl.c:556
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#4 0x00007ffff755faf5 in rtnl_link_add (sk=0x0,
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link=link@entry=0x55555595b0f0, flags=flags@entry=1024) at route/link.c:1548
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#5 0x000055555567a298 in macsec_drv_create_transmit_sc (priv=0x55555593b130,
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sc=0x55555593b320, conf_offset=<optimized out>) at ../src/drivers/driver_macsec_linux.c:998
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Signed-off-by: Davide Caratti <davide.caratti@gmail.com>
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---
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src/drivers/driver_macsec_linux.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/src/drivers/driver_macsec_linux.c b/src/drivers/driver_macsec_linux.c
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index 5dab77a..0694e60 100644
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--- a/src/drivers/driver_macsec_linux.c
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+++ b/src/drivers/driver_macsec_linux.c
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@@ -168,6 +168,9 @@ static int try_commit(struct macsec_drv_data *drv)
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{
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int err;
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+ if (!drv->sk)
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+ return 0;
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+
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if (!drv->link)
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return 0;
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@@ -982,6 +985,11 @@ static int macsec_drv_create_transmit_sc(
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wpa_printf(MSG_DEBUG, "%s", __func__);
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+ if (!drv->sk) {
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+ wpa_printf(MSG_ERROR, DRV_PREFIX "NULL rtnl socket");
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+ return -1;
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+ }
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+
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link = rtnl_link_macsec_alloc();
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if (!link) {
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wpa_printf(MSG_ERROR, DRV_PREFIX "couldn't allocate link");
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@@ -1048,6 +1056,9 @@ static int macsec_drv_delete_transmit_sc(void *priv, struct transmit_sc *sc)
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wpa_printf(MSG_DEBUG, "%s", __func__);
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+ if (!drv->sk)
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+ return 0;
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+
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if (!drv->created_link) {
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rtnl_link_put(drv->link);
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drv->link = NULL;
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--
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2.7.4
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