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authorWang Yufen <wangyufen@huawei.com>2022-11-01 09:31:36 +0800
committerDaniel Borkmann <daniel@iogearbox.net>2022-11-01 21:59:52 +0100
commit8ec95b94716a1e4d126edc3fb2bc426a717e2dba (patch)
tree76b1ba87fe4c5bf0fcaf394545a9fbd0d5adc290
parent42378a9ca55347102bbf86708776061d8fe3ece2 (diff)
downloadlinux-8ec95b94716a1e4d126edc3fb2bc426a717e2dba.tar.bz2
bpf, sockmap: Fix the sk->sk_forward_alloc warning of sk_stream_kill_queues
When running `test_sockmap` selftests, the following warning appears: WARNING: CPU: 2 PID: 197 at net/core/stream.c:205 sk_stream_kill_queues+0xd3/0xf0 Call Trace: <TASK> inet_csk_destroy_sock+0x55/0x110 tcp_rcv_state_process+0xd28/0x1380 ? tcp_v4_do_rcv+0x77/0x2c0 tcp_v4_do_rcv+0x77/0x2c0 __release_sock+0x106/0x130 __tcp_close+0x1a7/0x4e0 tcp_close+0x20/0x70 inet_release+0x3c/0x80 __sock_release+0x3a/0xb0 sock_close+0x14/0x20 __fput+0xa3/0x260 task_work_run+0x59/0xb0 exit_to_user_mode_prepare+0x1b3/0x1c0 syscall_exit_to_user_mode+0x19/0x50 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The root case is in commit 84472b436e76 ("bpf, sockmap: Fix more uncharged while msg has more_data"), where I used msg->sg.size to replace the tosend, causing breakage: if (msg->apply_bytes && msg->apply_bytes < tosend) tosend = psock->apply_bytes; Fixes: 84472b436e76 ("bpf, sockmap: Fix more uncharged while msg has more_data") Reported-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Wang Yufen <wangyufen@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Jakub Sitnicki <jakub@cloudflare.com> Link: https://lore.kernel.org/bpf/1667266296-8794-1-git-send-email-wangyufen@huawei.com
-rw-r--r--net/ipv4/tcp_bpf.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index c501c329b1db..cf9c3e8f7ccb 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -278,7 +278,7 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
{
bool cork = false, enospc = sk_msg_full(msg);
struct sock *sk_redir;
- u32 tosend, delta = 0;
+ u32 tosend, origsize, sent, delta = 0;
u32 eval = __SK_NONE;
int ret;
@@ -333,10 +333,12 @@ more_data:
cork = true;
psock->cork = NULL;
}
- sk_msg_return(sk, msg, msg->sg.size);
+ sk_msg_return(sk, msg, tosend);
release_sock(sk);
+ origsize = msg->sg.size;
ret = tcp_bpf_sendmsg_redir(sk_redir, msg, tosend, flags);
+ sent = origsize - msg->sg.size;
if (eval == __SK_REDIRECT)
sock_put(sk_redir);
@@ -375,7 +377,7 @@ more_data:
msg->sg.data[msg->sg.start].page_link &&
msg->sg.data[msg->sg.start].length) {
if (eval == __SK_REDIRECT)
- sk_mem_charge(sk, msg->sg.size);
+ sk_mem_charge(sk, tosend - sent);
goto more_data;
}
}