Commit 9261c9b0 authored Sep 06, 2005 by Eric Dumazet Committed by David S. Miller Sep 06, 2005

[NET]: Make sure l_linger is unsigned to avoid negative timeouts



One of my x86_64 (linux 2.6.13) server log is filled with :

schedule_timeout: wrong timeout value ffffffffffffff06 from ffffffff802e63ca
schedule_timeout: wrong timeout value ffffffffffffff06 from ffffffff802e63ca
schedule_timeout: wrong timeout value ffffffffffffff06 from ffffffff802e63ca
schedule_timeout: wrong timeout value ffffffffffffff06 from ffffffff802e63ca
schedule_timeout: wrong timeout value ffffffffffffff06 from ffffffff802e63ca

This is because some application does a

struct linger li;
li.l_onoff = 1;
li.l_linger = -1;
setsockopt(sock, SOL_SOCKET, SO_LINGER, &li, sizeof(li));

And unfortunatly l_linger is defined as a 'signed int' in
include/linux/socket.h:

struct linger {
         int             l_onoff;        /* Linger active                */
         int             l_linger;       /* How long to linger for       */
};

I dont know if it's safe to change l_linger to 'unsigned int' in the
include file (It might be defined as int in ABI specs)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent fe2d5295

net/core/sock.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -341,11 +341,11 @@ set_rcvbuf:
		sock_reset_flag(sk, SOCK_LINGER);
		else {
		#if (BITS_PER_LONG == 32)
		if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
		if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
		sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
		else
		#endif
		sk->sk_lingertime = ling.l_linger * HZ;
		sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
		sock_set_flag(sk, SOCK_LINGER);
		}
		break;

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