The commit is pushed to "branch-rh9-5.14.0-284.11.1.vz9.25.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh9-5.14.0-284.11.1.el9
------>
commit d47d786052c0003ac68eb59cd9c5e028c0cb73d7
Author: Chen Zhongjin <chenzhong...@huawei.com>
Date: Tue Nov 1 20:15:52 2022 +0800
ms/net, neigh: Fix null-ptr-deref in neigh_table_clear()
When IPv6 module gets initialized but hits an error in the middle,
kenel panic with:
KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f]
CPU: 1 PID: 361 Comm: insmod
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
RIP: 0010:__neigh_ifdown.isra.0+0x24b/0x370
RSP: 0018:ffff888012677908 EFLAGS: 00000202
...
Call Trace:
<TASK>
neigh_table_clear+0x94/0x2d0
ndisc_cleanup+0x27/0x40 [ipv6]
inet6_init+0x21c/0x2cb [ipv6]
do_one_initcall+0xd3/0x4d0
do_init_module+0x1ae/0x670
...
Kernel panic - not syncing: Fatal exception
When ipv6 initialization fails, it will try to cleanup and calls:
neigh_table_clear()
neigh_ifdown(tbl, NULL)
pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL))
# dev_net(NULL) triggers null-ptr-deref.
Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev
is NULL, to make kernel not panic immediately.
mFixes: 66ba215cb513 ("neigh: fix possible DoS due to net iface start/stop
loop")
Signed-off-by: Chen Zhongjin <chenzhong...@huawei.com>
Reviewed-by: Eric Dumazet <eduma...@google.com>
Reviewed-by: Denis V. Lunev <d...@openvz.org>
Link:
https://lore.kernel.org/r/20221101121552.21890-1-chenzhong...@huawei.com
Signed-off-by: Jakub Kicinski <k...@kernel.org>
(cherry picked from commit f8017317cb0b279b8ab98b0f3901a2e0ac880dad)
Signed-off-by: Konstantin Khorenko <khore...@virtuozzo.com>
Feature: fix ms/net
---
net/core/neighbour.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index e41708335ba2..75590a4787fc 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -385,7 +385,7 @@ static int __neigh_ifdown(struct neigh_table *tbl, struct
net_device *dev,
write_lock_bh(&tbl->lock);
neigh_flush_dev(tbl, dev, skip_perm);
pneigh_ifdown_and_unlock(tbl, dev);
- pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev));
+ pneigh_queue_purge(&tbl->proxy_queue, dev ? dev_net(dev) : NULL);
if (skb_queue_empty_lockless(&tbl->proxy_queue))
del_timer_sync(&tbl->proxy_timer);
return 0;
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