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net: fix possible overflow in __sk_mem_raise_allocated()

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[ Upstream commit 5bf325a532 ]

With many active TCP sockets, fat TCP sockets could fool
__sk_mem_raise_allocated() thanks to an overflow.

They would increase their share of the memory, instead
of decreasing it.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet
2019-02-12 12:26:27 -08:00
committed by Chris
parent f5bdf7123e
commit e5e5a37c81
2 changed files with 2 additions and 2 deletions
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2
include/net/sock.h
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@@ -1202,7 +1202,7 @@ static inline void sk_sockets_allocated_inc(struct sock *sk)
percpu_counter_inc(sk->sk_prot->sockets_allocated);
}
static inline int
static inline u64
sk_sockets_allocated_read_positive(struct sock *sk)
{
return percpu_counter_read_positive(sk->sk_prot->sockets_allocated);

2
net/core/sock.c
View File

@@ -2164,7 +2164,7 @@ int __sk_mem_schedule(struct sock *sk, int size, int kind)
}
if (sk_has_memory_pressure(sk)) {
int alloc;
u64 alloc;
if (!sk_under_memory_pressure(sk))
return 1;