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author | 2017-05-15 17:05:47 -0400 | |
---|---|---|
committer | 2017-05-16 12:45:21 -0400 | |
commit | bafbb9c73241760023d8981191ddd30bb1c6dbac (patch) | |
tree | 1db6b24ae97377ab0f55c1e36b8dd3ae91880422 /net/ipv4/tcp_input.c | |
parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
download | linux-bafbb9c73241760023d8981191ddd30bb1c6dbac.tar.gz linux-bafbb9c73241760023d8981191ddd30bb1c6dbac.tar.bz2 linux-bafbb9c73241760023d8981191ddd30bb1c6dbac.zip |
tcp: eliminate negative reordering in tcp_clean_rtx_queue
tcp_ack() can call tcp_fragment() which may dededuct the
value tp->fackets_out when MSS changes. When prior_fackets
is larger than tp->fackets_out, tcp_clean_rtx_queue() can
invoke tcp_update_reordering() with negative values. This
results in absurd tp->reodering values higher than
sysctl_tcp_max_reordering.
Note that tcp_update_reordering indeeds sets tp->reordering
to min(sysctl_tcp_max_reordering, metric), but because
the comparison is signed, a negative metric always wins.
Fixes: c7caf8d3ed7a ("[TCP]: Fix reord detection due to snd_una covered holes")
Reported-by: Rebecca Isaacs <risaacs@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 06e2dbc2b4a2..174d4376baa5 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3190,7 +3190,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, int delta; /* Non-retransmitted hole got filled? That's reordering */ - if (reord < prior_fackets) + if (reord < prior_fackets && reord <= tp->fackets_out) tcp_update_reordering(sk, tp->fackets_out - reord, 0); delta = tcp_is_fack(tp) ? pkts_acked : |