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authorEric Dumazet <edumazet@google.com>2017-11-02 18:10:03 -0700
committerDavid S. Miller <davem@davemloft.net>2017-11-03 16:02:56 +0900
commitf67971e683e81d7ba4739728511ae6e52a1b6321 (patch)
treec960635bc9e1813044d72d838df112acc04fc9b2 /net/ipv4
parentc509a8229d8df29c8308c4b03a1f6d69eb287acd (diff)
tcp: tcp_fragment() should not assume rtx skbs
While stress testing MTU probing, we had crashes in list_del() that we root-caused to the fact that tcp_fragment() is unconditionally inserting the freshly allocated skb into tsorted_sent_queue list. But this list is supposed to contain skbs that were sent. This was mostly harmless until MTU probing was enabled. Fortunately we can use the tcp_queue enum added later (but in same linux version) for rtx-rb-tree to fix the bug. Fixes: e2080072ed2d ("tcp: new list for sent but unacked skbs for RACK recovery") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Yuchung Cheng <ycheng@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Soheil Hassas Yeganeh <soheil@google.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Priyaranjan Jha <priyarjha@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_output.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 06a0c89ffe40..822962ece284 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1395,7 +1395,8 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
/* Link BUFF into the send queue. */
__skb_header_release(buff);
tcp_insert_write_queue_after(skb, buff, sk, tcp_queue);
- list_add(&buff->tcp_tsorted_anchor, &skb->tcp_tsorted_anchor);
+ if (tcp_queue == TCP_FRAG_IN_RTX_QUEUE)
+ list_add(&buff->tcp_tsorted_anchor, &skb->tcp_tsorted_anchor);
return 0;
}