diff options
| author | Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru> | 2023-01-28 19:09:52 +0100 |
|---|---|---|
| committer | Jozsef Kadlecsik <kadlec@netfilter.org> | 2023-01-28 19:09:52 +0100 |
| commit | f9a5f712132273139473cb322c3155375a1d1836 (patch) | |
| tree | 22d8b36c402fc113ce807795fc1400612f606e8b /kernel | |
| parent | 186f9b57c60bb53aae5f6633eff1e9d5e9095c3e (diff) | |
netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function.
When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of
an arithmetic expression 2 << (netmask - mask_bits - 1) is subject
to overflow due to a failure casting operands to a larger data type
before performing the arithmetic.
Note that it's harmless since the value will be checked at the next step.
Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.
Fixes: b9fed748185a ("netfilter: ipset: Check and reject crazy /0 input parameters")
Signed-off-by: Ilia.Gavrilov <Ilia.Gavrilov@infotecs.ru>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/net/netfilter/ipset/ip_set_bitmap_ip.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c b/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c index c488663..f37169c 100644 --- a/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c +++ b/kernel/net/netfilter/ipset/ip_set_bitmap_ip.c @@ -312,8 +312,8 @@ bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[], return -IPSET_ERR_BITMAP_RANGE; pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask); - hosts = 2 << (32 - netmask - 1); - elements = 2 << (netmask - mask_bits - 1); + hosts = 2U << (32 - netmask - 1); + elements = 2UL << (netmask - mask_bits - 1); } if (elements > IPSET_BITMAP_MAX_RANGE + 1) return -IPSET_ERR_BITMAP_RANGE_SIZE; |