From 7103ae4d8b24b171f5321894a9bb045d018f0f40 Mon Sep 17 00:00:00 2001 From: Guillaume Nault Date: Mon, 22 Oct 2018 12:24:05 +0200 Subject: ipv6: fix IPv6 processing of sessions that only have only a link-local address Several modules assume that if ses->ipv6 is set, then ses->ipv6->addr_list contains at least one element. But this is not true if ipv6 was allocated by the pseudo ipdb backend of ipv6cp (ipv6cp_opt_intfid.c). That is, if the PPP session only has an automatic link-local address. This leads modules like pppd-compat and dhcpv6 to access invalid memory when trying to retrieve the IPv6 address of a PPP session. Signed-off-by: Guillaume Nault --- accel-pppd/cli/show_sessions.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'accel-pppd/cli') diff --git a/accel-pppd/cli/show_sessions.c b/accel-pppd/cli/show_sessions.c index 443b186a..c725e05d 100644 --- a/accel-pppd/cli/show_sessions.c +++ b/accel-pppd/cli/show_sessions.c @@ -414,7 +414,7 @@ static void print_ip6(struct ap_session *ses, char *buf) struct in6_addr addr; char *ptr; - if (!ses->ipv6) { + if (!ses->ipv6 || list_empty(&ses->ipv6->addr_list)) { *buf = 0; return; } -- cgit v1.2.3