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authorDavid S. Miller <davem@davemloft.net>2009-02-06 00:49:55 -0800
committerDavid S. Miller <davem@davemloft.net>2009-02-06 00:49:55 -0800
commit684de409acff8b1fe8bf188d75ff2f99c624387d (patch)
treef8792653579a6a6a88634c7d73e794943c3a38d4 /net
parenta23f4bbd8d27ac8ddc5d71ace1f91bb503f0469a (diff)
downloadlinux-2.6.38-lt-ux500-684de409acff8b1fe8bf188d75ff2f99c624387d.tar.gz
ipv6: Disallow rediculious flowlabel option sizes.
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ip6_flowlabel.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index c62dd247774..7712578bdc6 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;