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net/x25: fix incorrect parameter validation in the x25_getsockopt() function 

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")
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 3ed5f41513
commit d6eb8de201
1 changed files with 2 additions and 2 deletions
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4
net/x25/af_x25.c
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@ -460,12 +460,12 @@ static int x25_getsockopt(struct socket *sock, int level, int optname,
if (get_user(len, optlen))
goto out;
len = min_t(unsigned int, len, sizeof(int));
rc = -EINVAL;
if (len < 0)
goto out;
len = min_t(unsigned int, len, sizeof(int));
rc = -EFAULT;
if (put_user(len, optlen))
goto out;