[IPSEC]: Fixed alg_key_len usage in attach_one_algo
The variable alg_key_len is in bits and not bytes. The function
attach_one_algo is currently using it as if it were in bytes.
This causes it to read memory which may not be there.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 5ddda2c..15ba086 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -162,6 +162,7 @@
struct rtattr *rta = u_arg;
struct xfrm_algo *p, *ualg;
struct xfrm_algo_desc *algo;
+ int len;
if (!rta)
return 0;
@@ -173,11 +174,12 @@
return -ENOSYS;
*props = algo->desc.sadb_alg_id;
- p = kmalloc(sizeof(*ualg) + ualg->alg_key_len, GFP_KERNEL);
+ len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
+ p = kmalloc(len, GFP_KERNEL);
if (!p)
return -ENOMEM;
- memcpy(p, ualg, sizeof(*ualg) + ualg->alg_key_len);
+ memcpy(p, ualg, len);
*algpp = p;
return 0;
}