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Date: Fri, 31 Jul 2020 09:18:01 +0200 From: Steffen Klassert <steffen.klassert@...unet.com> To: David Miller <davem@...emloft.net> CC: Herbert Xu <herbert@...dor.apana.org.au>, Steffen Klassert <steffen.klassert@...unet.com>, <netdev@...r.kernel.org> Subject: [PATCH 07/10] af_key: pfkey_dump needs parameter validation From: Mark Salyzyn <salyzyn@...roid.com> 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@...roid.com> Cc: netdev@...r.kernel.org Cc: linux-kernel@...r.kernel.org Cc: kernel-team@...roid.com Cc: Steffen Klassert <steffen.klassert@...unet.com> Cc: Herbert Xu <herbert@...dor.apana.org.au> Cc: "David S. Miller" <davem@...emloft.net> Cc: Jakub Kicinski <kuba@...nel.org> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com> --- net/key/af_key.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/key/af_key.c b/net/key/af_key.c index 979c579afc63..a915bc86620a 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -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]) { 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); if (filter == NULL) { mutex_unlock(&pfk->dump_lock); -- 2.17.1
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