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| author | Eric Dumazet <edumazet@google.com> | 2018-04-04 08:35:10 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-04-04 12:04:59 -0400 |
| commit | 3d23401283e80ceb03f765842787e0e79ff598b7 (patch) | |
| tree | a07bee3cbc8781374c747f6cbb20c51d6a650aad /net/ipv4/ip_fragment.c | |
| parent | 4b2e6877b8793b60abb75c15abaaa4377807a358 (diff) | |
| download | lwn-3d23401283e80ceb03f765842787e0e79ff598b7.tar.gz lwn-3d23401283e80ceb03f765842787e0e79ff598b7.zip | |
inet: frags: fix ip6frag_low_thresh boundary
Giving an integer to proc_doulongvec_minmax() is dangerous on 64bit arches,
since linker might place next to it a non zero value preventing a change
to ip6frag_low_thresh.
ip6frag_low_thresh is not used anymore in the kernel, but we do not
want to prematuraly break user scripts wanting to change it.
Since specifying a minimal value of 0 for proc_doulongvec_minmax()
is moot, let's remove these zero values in all defrag units.
Fixes: 6e00f7dd5e4e ("ipv6: frags: fix /proc/sys/net/ipv6/ip6frag_low_thresh")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_fragment.c')
| -rw-r--r-- | net/ipv4/ip_fragment.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 994fa70a910f..8e9528ebaa8e 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -667,7 +667,7 @@ struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) EXPORT_SYMBOL(ip_check_defrag); #ifdef CONFIG_SYSCTL -static long zero; +static int dist_min; static struct ctl_table ip4_frags_ns_ctl_table[] = { { @@ -684,7 +684,6 @@ static struct ctl_table ip4_frags_ns_ctl_table[] = { .maxlen = sizeof(unsigned long), .mode = 0644, .proc_handler = proc_doulongvec_minmax, - .extra1 = &zero, .extra2 = &init_net.ipv4.frags.high_thresh }, { @@ -700,7 +699,7 @@ static struct ctl_table ip4_frags_ns_ctl_table[] = { .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, - .extra1 = &zero + .extra1 = &dist_min, }, { } }; |