[PATCH RESEND bpf v3 3/8] udp: fix a memory leak in udp_read_sock()
From: Cong Wang <hidden>
Date: 2021-06-15 02:46:15
Also in:
netdev
Subsystem:
networking [general], the rest, user datagram protocol (udp) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Willem de Bruijn
From: Cong Wang <redacted>
sk_psock_verdict_recv() clones the skb and uses the clone
afterward, so udp_read_sock() should free the skb after using
it, regardless of error or not.
This fixes a real kmemleak.
Fixes: d7f571188ecf ("udp: Implement ->read_sock() for sockmap")
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jakub Sitnicki <jakub@cloudflare.com>
Cc: Lorenz Bauer <redacted>
Signed-off-by: Cong Wang <redacted>
---
net/ipv4/udp.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 15f5504adf5b..e31d67fd5183 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c@@ -1798,11 +1798,13 @@ int udp_read_sock(struct sock *sk, read_descriptor_t *desc, if (used <= 0) { if (!copied) copied = used; + kfree_skb(skb); break; } else if (used <= skb->len) { copied += used; } + kfree_skb(skb); if (!desc->count) break; }
--
2.25.1