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sysctl: Fix data races in proc_douintvec_minmax().
[ Upstream commit2d3b559df3
] A sysctl variable is accessed concurrently, and there is always a chance of data-race. So, all readers and writers need some basic protection to avoid load/store-tearing. This patch changes proc_douintvec_minmax() to use READ_ONCE() and WRITE_ONCE() internally to fix data-races on the sysctl side. For now, proc_douintvec_minmax() itself is tolerant to a data-race, but we still need to add annotations on the other subsystem's side. Fixes:61d9b56a89
("sysctl: add unsigned int range support") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -995,7 +995,7 @@ static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
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(param->max && *param->max < tmp))
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return -ERANGE;
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*valp = tmp;
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WRITE_ONCE(*valp, tmp);
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}
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return 0;
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