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udp: fix incorrect parameter validation in the udp_lib_getsockopt() function

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The 'len' variable can't be negative when assigned the result of
'min_t' because all 'min_t' parameters are cast to unsigned int,
and then the minimum one is chosen.

To fix the logic, check 'len' as read from 'optlen',
where the types of relevant variables are (signed) int.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@infotecs.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gavrilov Ilia 2024-03-07 14:23:50 +00:00 committed by David S. Miller
parent 955e9876ba
commit 4bb3ba7b74
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/udp.c
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@ -2791,11 +2791,11 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
if (get_user(len, optlen))
return -EFAULT;
len = min_t(unsigned int, len, sizeof(int));
if (len < 0)
return -EINVAL;
len = min_t(unsigned int, len, sizeof(int));
switch (optname) {
case UDP_CORK:
val = udp_test_bit(CORK, sk);