diff options
| author | David S. Miller <davem@davemloft.net> | 2009-02-06 00:49:55 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-17 09:46:20 -0800 |
| commit | 0e2fb41395560a4520e41c4f13287ddfb83a9d61 (patch) | |
| tree | 730d101b3e38d082088b36f3f30c3bcac2480c62 /net | |
| parent | 5d614e4b1d771f3d496f5d676d33473f519a865c (diff) | |
ipv6: Disallow rediculious flowlabel option sizes.
[ Upstream commit 684de409acff8b1fe8bf188d75ff2f99c624387d ]
Just like PKTINFO, limit the options area to 64K.
Based upon report by Eric Sesterhenn and analysis by
Roland Dreier.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/ip6_flowlabel.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index 37a4e777e347..489a7fd1abce 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -323,17 +323,21 @@ static struct ip6_flowlabel * fl_create(struct net *net, struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p) { - struct ip6_flowlabel *fl; + struct ip6_flowlabel *fl = NULL; int olen; int addr_type; int err; + olen = optlen - CMSG_ALIGN(sizeof(*freq)); + err = -EINVAL; + if (olen > 64 * 1024) + goto done; + err = -ENOMEM; fl = kzalloc(sizeof(*fl), GFP_KERNEL); if (fl == NULL) goto done; - olen = optlen - CMSG_ALIGN(sizeof(*freq)); if (olen > 0) { struct msghdr msg; struct flowi flowi; |