diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.co.jp> | 2020-07-21 09:15:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-31 19:37:48 +0300 |
| commit | 0f26f9672b5b961fcb721e9df8ee6608daf4049c (patch) | |
| tree | 5f162bed81f27d592f7d645638d2b87e849e5f87 /net/core | |
| parent | f971676781e347c429db89afa46dca8a3d3a40ab (diff) | |
| download | linux-0f26f9672b5b961fcb721e9df8ee6608daf4049c.tar.xz | |
udp: Copy has_conns in reuseport_grow().
[ Upstream commit f2b2c55e512879a05456eaf5de4d1ed2f7757509 ]
If an unconnected socket in a UDP reuseport group connect()s, has_conns is
set to 1. Then, when a packet is received, udp[46]_lib_lookup2() scans all
sockets in udp_hslot looking for the connected socket with the highest
score.
However, when the number of sockets bound to the port exceeds max_socks,
reuseport_grow() resets has_conns to 0. It can cause udp[46]_lib_lookup2()
to return without scanning all sockets, resulting in that packets sent to
connected sockets may be distributed to unconnected sockets.
Therefore, reuseport_grow() should copy has_conns.
Fixes: acdcecc61285 ("udp: correct reuseport selection with connected sockets")
CC: Willem de Bruijn <willemb@google.com>
Reviewed-by: Benjamin Herrenschmidt <benh@amazon.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/sock_reuseport.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/core/sock_reuseport.c b/net/core/sock_reuseport.c index fd38cf1d2b02..9c85ef2b7e1d 100644 --- a/net/core/sock_reuseport.c +++ b/net/core/sock_reuseport.c @@ -112,6 +112,7 @@ static struct sock_reuseport *reuseport_grow(struct sock_reuseport *reuse) more_reuse->prog = reuse->prog; more_reuse->reuseport_id = reuse->reuseport_id; more_reuse->bind_inany = reuse->bind_inany; + more_reuse->has_conns = reuse->has_conns; memcpy(more_reuse->socks, reuse->socks, reuse->num_socks * sizeof(struct sock *)); |