bpf, sockmap: Fix double uncharge the mem of sk_msg
stable inclusion from stable-v5.10.110 commit cd84ea3920aef936c559b63099ef0013ce6b2325 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I545NW Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cd84ea3920aef936c559b63099ef0013ce6b2325 -------------------------------- [ Upstream commit 2486ab43 ] If tcp_bpf_sendmsg is running during a tear down operation, psock may be freed. tcp_bpf_sendmsg() tcp_bpf_send_verdict() sk_msg_return() tcp_bpf_sendmsg_redir() unlikely(!psock)) sk_msg_free() The mem of msg has been uncharged in tcp_bpf_send_verdict() by sk_msg_return(), and would be uncharged by sk_msg_free() again. When psock is null, we can simply returning an error code, this would then trigger the sk_msg_free_nocharge in the error path of __SK_REDIRECT and would have the side effect of throwing an error up to user space. This would be a slight change in behavior from user side but would look the same as an error if the redirect on the socket threw an error. This issue can cause the following info: WARNING: CPU: 0 PID: 2136 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x13c/0x260 Call Trace: <TASK> __sk_destruct+0x24/0x1f0 sk_psock_destroy+0x19b/0x1c0 process_one_work+0x1b3/0x3c0 worker_thread+0x30/0x350 ? process_one_work+0x3c0/0x3c0 kthread+0xe6/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30 </TASK> Fixes: 604326b4 ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: NWang Yufen <wangyufen@huawei.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Acked-by: NJohn Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20220304081145.2037182-5-wangyufen@huawei.comSigned-off-by: NSasha Levin <sashal@kernel.org> Reviewed-by: NLiu Jian <liujian56@huawei.com> Reviewed-by: NWei Yongjun <weiyongjun1@huawei.com> Reviewed-by: NYue Haibing <yuehaibing@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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