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af_key: pfkey_dump needs parameter validation

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In pfkey_dump() dplen and splen can both be specified to access the
xfrm_address_t structure out of bounds in__xfrm_state_filter_match()
when it calls addr_match() with the indexes.  Return EINVAL if either
are out of range.

Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: kernel-team@android.com
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Mark Salyzyn 2020-07-22 04:00:53 -07:00 committed by Steffen Klassert
parent 101dde4207
commit 37bd22420f
1 changed files with 7 additions and 0 deletions
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7
net/key/af_key.c
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@ -1849,6 +1849,13 @@ static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_ms
if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
struct sadb_x_filter *xfilter = 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 >=
(sizeof(xfrm_address_t) << 3)) ||
(xfilter->sadb_x_filter_dplen >=
(sizeof(xfrm_address_t) << 3))) {
mutex_unlock(&pfk->dump_lock);
return -EINVAL;
}
filter = kmalloc(sizeof(*filter), GFP_KERNEL); filter = kmalloc(sizeof(*filter), GFP_KERNEL);
if (filter == NULL) { if (filter == NULL) {
mutex_unlock(&pfk->dump_lock); mutex_unlock(&pfk->dump_lock);