[linux-stable-4.14] tcp: clear tp->packets_out when purging write queue

Message ID 20180415004520.73294-1-soheil.kdev@gmail.com
State Not Applicable
Delegated to: David Miller
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  • [linux-stable-4.14] tcp: clear tp->packets_out when purging write queue
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Commit Message

Soheil Hassas Yeganeh April 15, 2018, 12:45 a.m.
From: Soheil Hassas Yeganeh <soheil@google.com>

Clear tp->packets_out when purging the write queue, otherwise
tcp_rearm_rto() mistakenly assumes TCP write queue is not empty.
This results in NULL pointer dereference.

Also, remove the redundant `tp->packets_out = 0` from
tcp_disconnect(), since tcp_disconnect() calls
tcp_write_queue_purge().

Fixes: a27fd7a8ed38 (tcp: purge write queue upon RST)
Reported-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Reported-by: Sami Farin <hvtaifwkbgefbaei@gmail.com>
Tested-by: Sami Farin <hvtaifwkbgefbaei@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
---
 include/net/tcp.h | 1 +
 net/ipv4/tcp.c    | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/include/net/tcp.h b/include/net/tcp.h
index d323d4fa742ca..fb653736f3353 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1616,6 +1616,7 @@  static inline void tcp_write_queue_purge(struct sock *sk)
 	sk_mem_reclaim(sk);
 	tcp_clear_all_retrans_hints(tcp_sk(sk));
 	tcp_init_send_head(sk);
+	tcp_sk(sk)->packets_out = 0;
 }
 
 static inline struct sk_buff *tcp_write_queue_head(const struct sock *sk)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 38b9a6276a9de..4dda8d301802e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2354,7 +2354,6 @@  int tcp_disconnect(struct sock *sk, int flags)
 	icsk->icsk_backoff = 0;
 	tp->snd_cwnd = 2;
 	icsk->icsk_probes_out = 0;
-	tp->packets_out = 0;
 	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	tp->snd_cwnd_cnt = 0;
 	tp->window_clamp = 0;