From 26932566a42d46aee7e5d526cb34fba9380cad10 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 31 Jan 2007 23:16:40 -0800 Subject: [NETLINK]: Don't BUG on undersized allocations Currently netlink users BUG when the allocated skb for an event notification is undersized. While this is certainly a kernel bug, its not critical and crashing the kernel is too drastic, especially when considering that these errors have appeared multiple times in the past and it BUGs even if no listeners are present. This patch replaces BUG by WARN_ON and changes the notification functions to inform potential listeners of undersized allocations using a unique error code (EMSGSIZE). Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/decnet/dn_dev.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'net/decnet/dn_dev.c') diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c index ed083ab455b7..90b3dfd72b49 100644 --- a/net/decnet/dn_dev.c +++ b/net/decnet/dn_dev.c @@ -749,7 +749,7 @@ static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa, nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); if (nlh == NULL) - return -ENOBUFS; + return -EMSGSIZE; ifm = nlmsg_data(nlh); ifm->ifa_family = AF_DECnet; @@ -768,7 +768,8 @@ static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa, return nlmsg_end(skb, nlh); nla_put_failure: - return nlmsg_cancel(skb, nlh); + nlmsg_cancel(skb, nlh); + return -EMSGSIZE; } static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa) @@ -781,9 +782,12 @@ static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa) goto errout; err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0); - /* failure implies BUG in dn_ifaddr_nlmsg_size() */ - BUG_ON(err < 0); - + if (err < 0) { + /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */ + WARN_ON(err == -EMSGSIZE); + kfree_skb(skb); + goto errout; + } err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL); errout: if (err < 0) -- cgit v1.2.3