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authorEric Dumazet <edumazet@google.com>2018-04-04 08:35:10 -0700
committerDavid S. Miller <davem@davemloft.net>2018-04-04 12:04:59 -0400
commit3d23401283e80ceb03f765842787e0e79ff598b7 (patch)
treea07bee3cbc8781374c747f6cbb20c51d6a650aad /net/ipv4/ip_fragment.c
parenttipc: Fix namespace violation in tipc_sk_fill_sock_diag (diff)
downloadlinux-dev-3d23401283e80ceb03f765842787e0e79ff598b7.tar.xz
linux-dev-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 ┼╗enczykowski <maze@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv4/ip_fragment.c5
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,
},
{ }
};