Patch "RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled" has been added to the 4.4-stable tree

Patch "RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rdma-cma-fix-unknown-symbol-when-config_ipv6-is-not-enabled.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b4cfe3971f6eab542dd7ecc398bfa1aeec889934 Mon Sep 17 00:00:00 2001
From: Jack Morgenstein <jackm@dev.mellanox.co.il>
Date: Sun, 15 Jan 2017 20:15:00 +0200
Subject: RDMA/cma: Fix unknown symbol when CONFIG_IPV6 is not enabled

From: Jack Morgenstein <jackm@dev.mellanox.co.il>

commit b4cfe3971f6eab542dd7ecc398bfa1aeec889934 upstream.

If IPV6 has not been enabled in the underlying kernel, we must avoid
calling IPV6 procedures in rdma_cm.ko.

This requires using "IS_ENABLED(CONFIG_IPV6)" in "if" statements
surrounding any code which calls external IPV6 procedures.

In the instance fixed here, procedure cma_bind_addr() called
ipv6_addr_type() -- which resulted in calling external procedure
__ipv6_addr_type().

Fixes: 6c26a77124ff ("RDMA/cma: fix IPv6 address resolution")
Cc: Spencer Baugh <sbaugh@catern.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Reviewed-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/core/cma.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -2578,7 +2578,8 @@ static int cma_bind_addr(struct rdma_cm_
 	if (!src_addr || !src_addr->sa_family) {
 		src_addr = (struct sockaddr *) &id->route.addr.src_addr;
 		src_addr->sa_family = dst_addr->sa_family;
-		if (dst_addr->sa_family == AF_INET6) {
+		if (IS_ENABLED(CONFIG_IPV6) &&
+		    dst_addr->sa_family == AF_INET6) {
 			struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
 			struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
 			src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;


Patches currently in stable-queue which might be from jackm@dev.mellanox.co.il are

queue-4.4/rdma-cma-fix-unknown-symbol-when-config_ipv6-is-not-enabled.patch