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net: Fix data-races around sysctl_mem.

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While reading .sysctl_mem, it can be changed concurrently.
So, we need to add READ_ONCE() to avoid data-races.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima 2022-07-06 16:40:00 -07:00 committed by David S. Miller
parent 3d32edf1f3
commit 310731e2f1
1 changed files with 1 additions and 1 deletions
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2
include/net/sock.h
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@ -1529,7 +1529,7 @@ void __sk_mem_reclaim(struct sock *sk, int amount);
/* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */
static inline long sk_prot_mem_limits(const struct sock *sk, int index) static inline long sk_prot_mem_limits(const struct sock *sk, int index)
{ {
long val = sk->sk_prot->sysctl_mem[index]; long val = READ_ONCE(sk->sk_prot->sysctl_mem[index]);
#if PAGE_SIZE > SK_MEM_QUANTUM #if PAGE_SIZE > SK_MEM_QUANTUM
val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT;