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icmp: Fix a data-race around sysctl_icmp_ratemask.

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While reading sysctl_icmp_ratemask, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

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 2022-07-11 17:15:28 -07:00 committed by David S. Miller
parent 2a4eb71484
commit 1ebcb25ad6
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/icmp.c
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@ -282,7 +282,7 @@ static bool icmpv4_mask_allow(struct net *net, int type, int code)
return true;
/* Limit if icmp type is enabled in ratemask. */
if (!((1 << type) & net->ipv4.sysctl_icmp_ratemask))
if (!((1 << type) & READ_ONCE(net->ipv4.sysctl_icmp_ratemask)))
return true;
return false;