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authorStefano Brivio <sbrivio@redhat.com>2019-01-02 12:29:27 (GMT)
committerDavid S. Miller <davem@davemloft.net>2019-01-02 18:29:20 (GMT)
commit7adf3246092f5e87ed0fa610e8088fae416c581f (patch)
treea1f95986879abc9bcc2dfcb296cfe0d64683fd3f /net
parent202700e30740c6568b5a6943662f3829566dd533 (diff)
ipv6: route: Fix return value of ip6_neigh_lookup() on neigh_create() error
In ip6_neigh_lookup(), we must not return errors coming from neigh_create(): if creation of a neighbour entry fails, the lookup should return NULL, in the same way as it's done in __neigh_lookup(). Otherwise, callers legitimately checking for a non-NULL return value of the lookup function might dereference an invalid pointer. For instance, on neighbour table overflow, ndisc_router_discovery() crashes ndisc_update() by passing ERR_PTR(-ENOBUFS) as 'neigh' argument. Reported-by: Jianlin Shi <jishi@redhat.com> Fixes: f8a1b43b709d ("net/ipv6: Create a neigh_lookup for FIB entries") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/route.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a94e0b0..40b225f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -210,7 +210,9 @@ struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
n = __ipv6_neigh_lookup(dev, daddr);
if (n)
return n;
- return neigh_create(&nd_tbl, daddr, dev);
+
+ n = neigh_create(&nd_tbl, daddr, dev);
+ return IS_ERR(n) ? NULL : n;
}
static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,

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