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netrom: fix api breakage in nr_setsockopt() 

This needs to copy an unsigned int from user space instead of a long to
avoid breaking user space with an API change.

I have updated all the integer overflow checks from ULONG to UINT as
well.  This is a slight API change but I do not expect it to affect
anything in real life.

Fixes: 3087a6f36e ("netrom: fix copying in user data in nr_setsockopt")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2022-01-07 10:12:10 +03:00 committed by David S. Miller
parent 9371937092
commit dc35616e6c
1 changed files with 6 additions and 6 deletions
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12
net/netrom/af_netrom.c
View File

@ -298,7 +298,7 @@ static int nr_setsockopt(struct socket *sock, int level, int optname,
{
struct sock *sk = sock->sk;
struct nr_sock *nr = nr_sk(sk);
unsigned long opt;
unsigned int opt;
if (level != SOL_NETROM)
return -ENOPROTOOPT;
@ -306,18 +306,18 @@ static int nr_setsockopt(struct socket *sock, int level, int optname,
if (optlen < sizeof(unsigned int))
return -EINVAL;
if (copy_from_sockptr(&opt, optval, sizeof(unsigned long)))
if (copy_from_sockptr(&opt, optval, sizeof(opt)))
return -EFAULT;
switch (optname) {
case NETROM_T1:
if (opt < 1 || opt > ULONG_MAX / HZ)
if (opt < 1 || opt > UINT_MAX / HZ)
return -EINVAL;
nr->t1 = opt * HZ;
return 0;
case NETROM_T2:
if (opt < 1 || opt > ULONG_MAX / HZ)
if (opt < 1 || opt > UINT_MAX / HZ)
return -EINVAL;
nr->t2 = opt * HZ;
return 0;
@ -329,13 +329,13 @@ static int nr_setsockopt(struct socket *sock, int level, int optname,
return 0;
case NETROM_T4:
if (opt < 1 || opt > ULONG_MAX / HZ)
if (opt < 1 || opt > UINT_MAX / HZ)
return -EINVAL;
nr->t4 = opt * HZ;
return 0;
case NETROM_IDLE:
if (opt > ULONG_MAX / (60 * HZ))
if (opt > UINT_MAX / (60 * HZ))
return -EINVAL;
nr->idle = opt * 60 * HZ;
return 0;