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authorJohn Fastabend <john.fastabend@gmail.com>2019-05-13 21:42:03 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2019-05-16 01:36:13 +0200
commit5fa2ca7c4a3fc176f31b495e1a704862d8188b53 (patch)
tree2f7430872ef925272582946476844d2d0bd3a61f /net/ipv4/tcp_bpf.c
parent3d21b6525caeae45f08e2d3a07ddfdef64882b8b (diff)
bpf, tcp: correctly handle DONT_WAIT flags and timeo == 0
The tcp_bpf_wait_data() routine needs to check timeo != 0 before calling sk_wait_event() otherwise we may see unexpected stalls on receiver. Arika did all the leg work here I just formatted, posted and ran a few tests. Fixes: 604326b41a6fb ("bpf, sockmap: convert to generic sk_msg interface") Reported-by: Arika Chen <eaglesora@gmail.com> Suggested-by: Arika Chen <eaglesora@gmail.com> Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/ipv4/tcp_bpf.c')
-rw-r--r--net/ipv4/tcp_bpf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index 4a619c85daed..3d1e15401384 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -27,7 +27,10 @@ static int tcp_bpf_wait_data(struct sock *sk, struct sk_psock *psock,
int flags, long timeo, int *err)
{
DEFINE_WAIT_FUNC(wait, woken_wake_function);
- int ret;
+ int ret = 0;
+
+ if (!timeo)
+ return ret;
add_wait_queue(sk_sleep(sk), &wait);
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);