3.6-stable review patch. If anyone has any objections, please let me know.
------------------ From: Cyrill Gorcunov <gorcu...@openvz.org> [ 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 <gorcu...@openvz.org> CC: David Miller <da...@davemloft.net> CC: Eric Dumazet <eric.duma...@gmail.com> CC: Pavel Emelyanov <xe...@parallels.com> Acked-by: Pavel Emelyanov <xe...@parallels.com> Signed-off-by: David S. Miller <da...@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- net/ipv4/inet_diag.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -883,13 +883,16 @@ static int __inet_diag_dump(struct sk_bu struct inet_diag_req_v2 *r, struct nlattr *bc) { const struct inet_diag_handler *handler; + int err = 0; handler = inet_diag_lock_handler(r->sdiag_protocol); if (!IS_ERR(handler)) handler->dump(skb, cb, r, bc); + else + err = PTR_ERR(handler); inet_diag_unlock_handler(handler); - return skb->len; + return err ? : skb->len; } static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html