infiniband: avoid dereferencing uninitialized dst on error path

With commit eea40b8f624f ("infiniband: call ipv6 route lookup
via the stub interface"), if the route lookup fails due to
ipv6 being disabled, the dst variable is left untouched, and
the following dst_release() may access uninitialized memory.

Since ipv6_dst_lookup() always sets dst to NULL in case of
lookup failure with ipv6 enabled, fix the above just
returning the error code if the lookup fails.

Fixes: eea40b8f624 ("infiniband: call ipv6 route lookup via the stub interface")
Reported-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 523d243201007dacd181d49b3ccf78b7fea96742..02971e239a182debc69aea1306169be981d97086 100644 (file)
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -446,7 +446,7 @@ static int addr6_resolve(struct sockaddr_in6 *src_in,
 
        ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
        if (ret < 0)
-               goto put;
+               return ret;
 
        rt = (struct rt6_info *)dst;
        if (ipv6_addr_any(&fl6.saddr)) {