net: inet_diag -- Return error code if protocol handler is missed
authorCyrill Gorcunov <gorcunov@openvz.org>
Sat, 3 Nov 2012 09:30:34 +0000 (09:30 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 17 Nov 2012 21:19:04 +0000 (13:19 -0800)
commit491eea6d0163ea9ff41892851eb5542997f2216c
tree5db643489aecdff8d5472176dc890f23aeab40b8
parent3583fce0d7937bfbf9846928f5cd41e11b5e4538
net: inet_diag -- Return error code if protocol handler is missed

[ Upstream commit cacb6ba0f36ab14a507f4ee7697e8332899015d2 ]

We've observed that in case if UDP diag module is not
supported in kernel the netlink returns NLMSG_DONE without
notifying a caller that handler is missed.

This patch makes __inet_diag_dump to return error code instead.

So as example it become possible to detect such situation
and handle it gracefully on userspace level.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: David Miller <davem@davemloft.net>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/ipv4/inet_diag.c