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[NETLINK]: Don't BUG on undersized allocations

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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 <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2007-01-31 23:16:40 -08:00
committed by David S. Miller
parent 2cf6c36cb4
commit 26932566a4
12 changed files with 149 additions and 85 deletions
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23
net/core/rtnetlink.c
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@@ -320,7 +320,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
if (nlh == NULL)
return -ENOBUFS;
return -EMSGSIZE;
ifm = nlmsg_data(nlh);
ifm->ifi_family = AF_UNSPEC;
@@ -384,7 +384,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
return nlmsg_end(skb, nlh);
nla_put_failure:
return nlmsg_cancel(skb, nlh);
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
@@ -633,9 +634,12 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
/* failure impilies BUG in if_nlmsg_size or wireless_rtnetlink_get */
BUG_ON(err < 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size */
WARN_ON(err == -EMSGSIZE);
kfree_skb(nskb);
goto errout;
}
err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
errout:
kfree(iw_buf);
@@ -678,9 +682,12 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
goto errout;
err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
/* failure implies BUG in if_nlmsg_size() */
BUG_ON(err < 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
errout:
if (err < 0)