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| author | Eric Dumazet <edumazet@google.com> | 2012-04-18 10:14:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-18 16:52:45 -0400 |
| commit | 22b4a4f22da4b39c6f7f679fd35f3d35c91bf851 (patch) | |
| tree | 6cd9d5d169384e39c030e18f75c1b1e0d792e5bd /net/ipv4/tcp_output.c | |
| parent | 56fa9b16303b0a3bad88ff528c4d5ff54d8cdb47 (diff) | |
| download | linux-22b4a4f22da4b39c6f7f679fd35f3d35c91bf851.tar.gz linux-22b4a4f22da4b39c6f7f679fd35f3d35c91bf851.tar.xz | |
tcp: fix retransmit of partially acked frames
Alexander Beregalov reported skb_over_panic errors and provided stack
trace.
I occurs commit a21d45726aca (tcp: avoid order-1 allocations on wifi and
tx path) added a regression, when a retransmit is done after a partial
ACK.
tcp_retransmit_skb() tries to aggregate several frames if the first one
has enough available room to hold the following ones payload. This is
controlled by /proc/sys/net/ipv4/tcp_retrans_collapse tunable (default :
enabled)
Problem is we must make sure _pskb_trim_head() doesnt fool
skb_availroom() when pulling some bytes from skb (this pull is done when
receiver ACK part of the frame).
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Marc MERLIN <marc@merlins.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
| -rw-r--r-- | net/ipv4/tcp_output.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 376b2cfbb685..7ac6423117ad 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1096,6 +1096,7 @@ static void __pskb_trim_head(struct sk_buff *skb, int len) eat = min_t(int, len, skb_headlen(skb)); if (eat) { __skb_pull(skb, eat); + skb->avail_size -= eat; len -= eat; if (!len) return; |