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| author | Eric Dumazet <edumazet@google.com> | 2019-05-15 09:10:15 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-15 09:22:41 -0700 |
| commit | 858f5017446764e8bca0b29589a3b164186ae471 (patch) | |
| tree | 373f0ffe2041cc465d0c0582b27da70f6179d7ee /net | |
| parent | 22fb43f36006a3d42b7ab34df0f14ded3d513eda (diff) | |
| download | linux-858f5017446764e8bca0b29589a3b164186ae471.tar.gz linux-858f5017446764e8bca0b29589a3b164186ae471.tar.bz2 linux-858f5017446764e8bca0b29589a3b164186ae471.zip | |
tcp: do not recycle cloned skbs
It is illegal to change arbitrary fields in skb_shared_info if the
skb is cloned.
Before calling skb_zcopy_clear() we need to ensure this rule,
therefore we need to move the test from sk_stream_alloc_skb()
to sk_wmem_free_skb()
Fixes: 4f661542a402 ("tcp: fix zerocopy and notsent_lowat issues")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Diagnosed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 1fa15beb8380..53d61ca3ac4b 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -855,7 +855,7 @@ struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, if (likely(!size)) { skb = sk->sk_tx_skb_cache; - if (skb && !skb_cloned(skb)) { + if (skb) { skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); sk->sk_tx_skb_cache = NULL; pskb_trim(skb, 0); |