net: af_key: fix sadb_x_filter validation

When running xfrm_state_walk_init(), the xfrm_address_filter being used
is okay to have a splen/dplen that equals to sizeof(xfrm_address_t)<<3.
This commit replaces >= to > to make sure the boundary checking is
correct.

Fixes: 37bd22420f85 ("af_key: pfkey_dump needs parameter validation")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/key/af_key.c b/net/key/af_key.c
index ede3c6a..b4ea4cf 100644 (file)
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1848,9 +1848,9 @@ static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_ms
        if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
                struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
 
-               if ((xfilter->sadb_x_filter_splen >=
+               if ((xfilter->sadb_x_filter_splen >
                        (sizeof(xfrm_address_t) << 3)) ||
-                   (xfilter->sadb_x_filter_dplen >=
+                   (xfilter->sadb_x_filter_dplen >
                        (sizeof(xfrm_address_t) << 3))) {
                        mutex_unlock(&pfk->dump_lock);
                        return -EINVAL;