diff options
| author |   Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-08-23 10:46:49 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2022-08-24 13:46:57 +0100 |
| commit | 7de6d09f51917c829af2b835aba8bb5040f8e86a (patch) | |
| tree | 89c4f938d7771f6a35cc25e7e2c3db1d6566f293 /net/ipv6 | |
| parent | ratelimit: Fix data-races in ___ratelimit(). (diff) | |
| download | linux-dev-7de6d09f51917c829af2b835aba8bb5040f8e86a.tar.xz linux-dev-7de6d09f51917c829af2b835aba8bb5040f8e86a.zip | |
net: Fix data-races around sysctl_optmem_max.
While reading sysctl_optmem_max, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its readers.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/ipv6_sockglue.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 222f6bf220ba..e0dcc7a193df 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -210,7 +210,7 @@ static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, if (optlen < GROUP_FILTER_SIZE(0)) return -EINVAL; - if (optlen > sysctl_optmem_max) + if (optlen > READ_ONCE(sysctl_optmem_max)) return -ENOBUFS; gsf = memdup_sockptr(optval, optlen); @@ -244,7 +244,7 @@ static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval, if (optlen < size0) return -EINVAL; - if (optlen > sysctl_optmem_max - 4) + if (optlen > READ_ONCE(sysctl_optmem_max) - 4) return -ENOBUFS; p = kmalloc(optlen + 4, GFP_KERNEL); |