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authorJohannes Berg <johannes.berg@intel.com>2011-11-03 00:07:32 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:44:43 -0800
commit61ec3a5696f0c32448c93b713f934b007b85f961 (patch)
tree457b77f5305517b77e732e5335bd4cd823cdedd2 /lib/nlattr.c
parent0fb9f687964a4b4a557b4f2e8676e1236a9e269b (diff)
netlink: validate NLA_MSECS length
commit c30bc94758ae2a38a5eb31767c1985c0aae0950b upstream. L2TP for example uses NLA_MSECS like this: policy: [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, code: if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); As nla_get_msecs() is essentially nla_get_u64() plus the conversion to a HZ-based value, this will not properly reject attributes from userspace that aren't long enough and might overrun the message. Add NLA_MSECS to the attribute minlen array to check the size properly. Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib/nlattr.c')
-rw-r--r--lib/nlattr.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/nlattr.c b/lib/nlattr.c
index ac09f2226dc7..a8408b6cacdf 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -20,6 +20,7 @@ static const u16 nla_attr_minlen[NLA_TYPE_MAX+1] = {
[NLA_U16] = sizeof(u16),
[NLA_U32] = sizeof(u32),
[NLA_U64] = sizeof(u64),
+ [NLA_MSECS] = sizeof(u64),
[NLA_NESTED] = NLA_HDRLEN,
};