diff options
| author | Joe Stringer <joe@wand.net.nz> | 2020-03-30 01:53:40 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-03-30 23:45:05 +0300 |
| commit | 7ae215d23c12a939005f35d1848ca55b6109b9c0 (patch) | |
| tree | bc88bf441433f5bf7a3d66610adb5d1ad1707390 /net/core/sock.c | |
| parent | 71489e21d720a09388b565d60ef87ae993c10528 (diff) | |
| download | linux-7ae215d23c12a939005f35d1848ca55b6109b9c0.tar.xz | |
bpf: Don't refcount LISTEN sockets in sk_assign()
Avoid taking a reference on listen sockets by checking the socket type
in the sk_assign and in the corresponding skb_steal_sock() code in the
the transport layer, and by ensuring that the prefetch free (sock_pfree)
function uses the same logic to check whether the socket is refcounted.
Suggested-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200329225342.16317-4-joe@wand.net.nz
Diffstat (limited to 'net/core/sock.c')
| -rw-r--r-- | net/core/sock.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 87e3a03c9056..da32d9b6d09f 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2077,7 +2077,8 @@ EXPORT_SYMBOL(sock_efree); #ifdef CONFIG_INET void sock_pfree(struct sk_buff *skb) { - sock_gen_put(skb->sk); + if (sk_is_refcounted(skb->sk)) + sock_gen_put(skb->sk); } EXPORT_SYMBOL(sock_pfree); #endif /* CONFIG_INET */ |