netfilter: ipset: fix hash size checking in kernel

The hash size must fit both into u32 (jhash) and the max value of
size_t. The missing checking could lead to kernel crash, bug reported
by Seblu.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/netfilter/ipset/ip_set_ahash.h

@@ -99,6 +99,22 @@ struct ip_set_hash {
 #endif
 };
 
+static size_t
+htable_size(u8 hbits)
+{
+	size_t hsize;
+
+	/* We must fit both into u32 in jhash and size_t */
+	if (hbits > 31)
+		return 0;
+	hsize = jhash_size(hbits);
+	if ((((size_t)-1) - sizeof(struct htable))/sizeof(struct hbucket)
+	    < hsize)
+		return 0;
+
+	return hsize * sizeof(struct hbucket) + sizeof(struct htable);
+}
+
 /* Compute htable_bits from the user input parameter hashsize */
 static u8
 htable_bits(u32 hashsize)

net/netfilter/ipset/ip_set_hash_ip.c

@@ -364,6 +364,7 @@ hash_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 {
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	u8 netmask, hbits;
+	size_t hsize;
 	struct ip_set_hash *h;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
@@ -405,9 +406,12 @@ hash_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->timeout = IPSET_NO_TIMEOUT;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;

net/netfilter/ipset/ip_set_hash_ipport.c

@@ -449,6 +449,7 @@ hash_ipport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	struct ip_set_hash *h;
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	u8 hbits;
+	size_t hsize;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 		return -IPSET_ERR_INVALID_FAMILY;
@@ -476,9 +477,12 @@ hash_ipport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->timeout = IPSET_NO_TIMEOUT;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;

net/netfilter/ipset/ip_set_hash_ipportip.c

@@ -467,6 +467,7 @@ hash_ipportip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	struct ip_set_hash *h;
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	u8 hbits;
+	size_t hsize;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 		return -IPSET_ERR_INVALID_FAMILY;
@@ -494,9 +495,12 @@ hash_ipportip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->timeout = IPSET_NO_TIMEOUT;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;

net/netfilter/ipset/ip_set_hash_ipportnet.c

@@ -616,6 +616,7 @@ hash_ipportnet_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	struct ip_set_hash *h;
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	u8 hbits;
+	size_t hsize;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 		return -IPSET_ERR_INVALID_FAMILY;
@@ -645,9 +646,12 @@ hash_ipportnet_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->timeout = IPSET_NO_TIMEOUT;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;

net/netfilter/ipset/ip_set_hash_net.c

@@ -460,6 +460,7 @@ hash_net_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	struct ip_set_hash *h;
 	u8 hbits;
+	size_t hsize;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 		return -IPSET_ERR_INVALID_FAMILY;
@@ -489,9 +490,12 @@ hash_net_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->timeout = IPSET_NO_TIMEOUT;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;

net/netfilter/ipset/ip_set_hash_netiface.c

@@ -722,6 +722,7 @@ hash_netiface_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	struct ip_set_hash *h;
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	u8 hbits;
+	size_t hsize;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 		return -IPSET_ERR_INVALID_FAMILY;
@@ -752,9 +753,12 @@ hash_netiface_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->ahash_max = AHASH_MAX_SIZE;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;

net/netfilter/ipset/ip_set_hash_netport.c

@@ -572,6 +572,7 @@ hash_netport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	struct ip_set_hash *h;
 	u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
 	u8 hbits;
+	size_t hsize;
 
 	if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
 		return -IPSET_ERR_INVALID_FAMILY;
@@ -601,9 +602,12 @@ hash_netport_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
 	h->timeout = IPSET_NO_TIMEOUT;
 
 	hbits = htable_bits(hashsize);
-	h->table = ip_set_alloc(
-			sizeof(struct htable)
-			+ jhash_size(hbits) * sizeof(struct hbucket));
+	hsize = htable_size(hbits);
+	if (hsize == 0) {
+		kfree(h);
+		return -ENOMEM;
+	}
+	h->table = ip_set_alloc(hsize);
 	if (!h->table) {
 		kfree(h);
 		return -ENOMEM;