net: prevent setting ttl=0 via IP_TTL
authorCong Wang <xiyou.wangcong@gmail.com>
Mon, 7 Jan 2013 21:17:00 +0000 (21:17 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 9 Jan 2013 01:57:10 +0000 (17:57 -0800)
A regression is introduced by the following commit:

commit 4d52cfbef6266092d535237ba5a4b981458ab171
Author: Eric Dumazet <eric.dumazet@gmail.com>
Date:   Tue Jun 2 00:42:16 2009 -0700

    net: ipv4/ip_sockglue.c cleanups

    Pure cleanups

but it is not a pure cleanup...

-               if (val != -1 && (val < 1 || val>255))
+               if (val != -1 && (val < 0 || val > 255))

Since there is no reason provided to allow ttl=0, change it back.

Reported-by: nitin padalia <padalia.nitin@gmail.com>
Cc: nitin padalia <padalia.nitin@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ip_sockglue.c

index 3c9d20880283de0f9b5244eae8184e76d9a20dcd..d9c4f113d7093bba7eba2beefc31cd0af4b9bb95 100644 (file)
@@ -590,7 +590,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
        case IP_TTL:
                if (optlen < 1)
                        goto e_inval;
-               if (val != -1 && (val < 0 || val > 255))
+               if (val != -1 && (val < 1 || val > 255))
                        goto e_inval;
                inet->uc_ttl = val;
                break;