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mptcp: never fetch fwd memory from the subflow

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The memory accounting is broken in such exceptional code
path, and after commit 4890b686f4 ("net: keep sk->sk_forward_alloc
as small as possible") we can't find much help there.

Drop the broken code.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2022-06-30 15:17:54 -07:00 committed by David S. Miller
parent 456bfd9dc8
commit 4aaa1685f7
1 changed files with 3 additions and 8 deletions
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11
net/mptcp/protocol.c
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@ -328,15 +328,10 @@ static bool mptcp_rmem_schedule(struct sock *sk, struct sock *ssk, int size)
amt = sk_mem_pages(size);
amount = amt << PAGE_SHIFT;
msk->rmem_fwd_alloc += amount;
if (!__sk_mem_raise_allocated(sk, size, amt, SK_MEM_RECV)) {
if (ssk->sk_forward_alloc < amount) {
msk->rmem_fwd_alloc -= amount;
return false;
}
if (!__sk_mem_raise_allocated(sk, size, amt, SK_MEM_RECV))
return false;
ssk->sk_forward_alloc -= amount;
}
msk->rmem_fwd_alloc += amount;
return true;
}