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icmp: Fix a data-race around sysctl_icmp_ratemask.

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[ Upstream commit 1ebcb25ad6fc3d50fca87350acf451b9a66dd31e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kuniyuki Iwashima
2022-07-11 17:15:28 -07:00
committed by Greg Kroah-Hartman
parent 4ebf261532
commit 38d78c7b4b
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/icmp.c
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@@ -290,7 +290,7 @@ 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;