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[IPV6]: fix lockup via /proc/net/ip6_flowlabel (CVE-2006-5619)

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There's a bug in the seqfile handling for /proc/net/ip6_flowlabel, where,
after finding a flowlabel, the code will loop forever not finding any
further flowlabels, first traversing the rest of the hash bucket then just
looping.

This patch fixes the problem by breaking after the hash bucket has been
traversed.

Note that this bug can cause lockups and oopses, and is trivially invoked
by an unpriveleged user.

Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
This commit is contained in:
James Morris
2006-11-05 09:00:45 +01:00
committed by Adrian Bunk
parent e4943436e2
commit d1ce361a6c
1 changed files with 2 additions and 0 deletions
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net/ipv6/ip6_flowlabel.c
+2
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@@ -589,6 +589,8 @@ static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flo
while (!fl) {
if (++state->bucket <= FL_HASH_MASK)
fl = fl_ht[state->bucket];
else
break;
}
return fl;
}