43 lines
1.6 KiB
Diff
43 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Fri, 21 Jun 2019 06:09:55 -0700
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Subject: [PATCH] tcp: refine memory limit test in tcp_fragment()
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tcp_fragment() might be called for skbs in the write queue.
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Memory limits might have been exceeded because tcp_sendmsg() only
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checks limits at full skb (64KB) boundaries.
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Therefore, we need to make sure tcp_fragment() wont punish applications
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that might have setup very low SO_SNDBUF values.
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Fixes: f070ef2ac667 ("tcp: tcp_fragment() should apply sane memory limits")
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Reported-by: Christoph Paasch <cpaasch@apple.com>
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Tested-by: Christoph Paasch <cpaasch@apple.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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BugLink: https://bugs.launchpad.net/bugs/1831638
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CVE-2019-11478
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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net/ipv4/tcp_output.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
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index e471ec48dcbc..de76eb94b4d2 100644
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--- a/net/ipv4/tcp_output.c
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+++ b/net/ipv4/tcp_output.c
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@@ -1321,7 +1321,8 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
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if (nsize < 0)
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nsize = 0;
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- if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf)) {
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+ if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf &&
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+ tcp_queue != TCP_FRAG_IN_WRITE_QUEUE)) {
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NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPWQUEUETOOBIG);
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return -ENOMEM;
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}
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