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| author | Eric Dumazet <edumazet@google.com> | 2022-06-14 20:17:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 12:09:27 +0300 |
| commit | ec9b323094ce4689f772feffafe2775a87cebbcb (patch) | |
| tree | d3fd2d0afba93f5f3325bf0629e085f1c466499a | |
| parent | cec1c921fcc5601b6da9b9a1e764adf6f4b79255 (diff) | |
| download | linux-ec9b323094ce4689f772feffafe2775a87cebbcb.tar.xz | |
tcp: fix over estimation in sk_forced_mem_schedule()
commit c4ee118561a0f74442439b7b5b486db1ac1ddfeb upstream.
sk_forced_mem_schedule() has a bug similar to ones fixed
in commit 7c80b038d23e ("net: fix sk_wmem_schedule() and
sk_rmem_schedule() errors")
While this bug has little chance to trigger in old kernels,
we need to fix it before the following patch.
Fixes: d83769a580f1 ("tcp: fix possible deadlock in tcp_send_fin()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv4/tcp_output.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 5b6d935a028c..49061c3fc218 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2986,11 +2986,12 @@ begin_fwd: */ void sk_forced_mem_schedule(struct sock *sk, int size) { - int amt; + int delta, amt; - if (size <= sk->sk_forward_alloc) + delta = size - sk->sk_forward_alloc; + if (delta <= 0) return; - amt = sk_mem_pages(size); + amt = sk_mem_pages(delta); sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; sk_memory_allocated_add(sk, amt); |