From 94b95dfaa814f565d92f5a65f0ff12a483095522 Mon Sep 17 00:00:00 2001 From: Leon Romanovsky Date: Wed, 19 Apr 2023 15:19:07 +0300 Subject: [PATCH] xfrm: release all offloaded policy memory Failure to add offloaded policy will cause to the following error once user will try to reload driver. Unregister_netdevice: waiting for eth3 to become free. Usage count = 2 This was caused by xfrm_dev_policy_add() which increments reference to net_device. That reference was supposed to be decremented in xfrm_dev_policy_free(). However the latter wasn't called. unregister_netdevice: waiting for eth3 to become free. Usage count = 2 leaked reference. xfrm_dev_policy_add+0xff/0x3d0 xfrm_policy_construct+0x352/0x420 xfrm_add_policy+0x179/0x320 xfrm_user_rcv_msg+0x1d2/0x3d0 netlink_rcv_skb+0xe0/0x210 xfrm_netlink_rcv+0x45/0x50 netlink_unicast+0x346/0x490 netlink_sendmsg+0x3b0/0x6c0 sock_sendmsg+0x73/0xc0 sock_write_iter+0x13b/0x1f0 vfs_write+0x528/0x5d0 ksys_write+0x120/0x150 do_syscall_64+0x3d/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Fixes: 919e43fad516 ("xfrm: add an interface to offload policy") Signed-off-by: Leon Romanovsky Reviewed-by: Simon Horman Reviewed-by: Eric Dumazet Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_user.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 103af2b..af8fbcb 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1978,6 +1978,7 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, if (err) { xfrm_dev_policy_delete(xp); + xfrm_dev_policy_free(xp); security_xfrm_policy_free(xp->security); kfree(xp); return err; -- 2.7.4