net: prevent setting ttl=0 via IP_TTL

A regression is introduced by the following commit: commit 4d52cfb Author: Eric Dumazet <[email protected]> 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 <[email protected]> Cc: nitin padalia <[email protected]> Cc: Eric Dumazet <[email protected]> Cc: David S. Miller <[email protected]> Signed-off-by: Cong Wang <[email protected]> Acked-by: Eric Dumazet <[email protected]> Signed-off-by: David S. Miller <[email protected]>
progmanos · Jan 9, 2013 · c9be4a5 · c9be4a5
1 parent ed2c891
commit c9be4a5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
@@ -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;