[PATCH] rose: af_rose: avoid overflows in rose_setsockopt()

[Young Xiao]

Check setsockopt arguments to avoid overflows and return -EINVAL for
too large arguments.

See commit 32288eb4d940 ("netrom: avoid overflows in nr_setsockopt()")
for details.

Signed-off-by: Young Xiao <92siuy...@gmail.com>
---
 net/rose/af_rose.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index e274bc6..af831ee9 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -372,15 +372,15 @@ static int rose_setsockopt(struct socket *sock, int 
level, int optname,
 {
        struct sock *sk = sock->sk;
        struct rose_sock *rose = rose_sk(sk);
-       int opt;
+       unsigned long opt;
 
        if (level != SOL_ROSE)
                return -ENOPROTOOPT;
 
-       if (optlen < sizeof(int))
+       if (optlen < sizeof(unsigned int))
                return -EINVAL;
 
-       if (get_user(opt, (int __user *)optval))
+       if (get_user(opt, (unsigned int __user *)optval))
                return -EFAULT;
 
        switch (optname) {
@@ -389,31 +389,31 @@ static int rose_setsockopt(struct socket *sock, int 
level, int optname,
                return 0;
 
        case ROSE_T1:
-               if (opt < 1)
+               if (opt < 1 || opt > ULONG_MAX / HZ)
                        return -EINVAL;
                rose->t1 = opt * HZ;
                return 0;
 
        case ROSE_T2:
-               if (opt < 1)
+               if (opt < 1 || opt > ULONG_MAX / HZ)
                        return -EINVAL;
                rose->t2 = opt * HZ;
                return 0;
 
        case ROSE_T3:
-               if (opt < 1)
+               if (opt < 1 || opt > ULONG_MAX / HZ)
                        return -EINVAL;
                rose->t3 = opt * HZ;
                return 0;
 
        case ROSE_HOLDBACK:
-               if (opt < 1)
+               if (opt < 1 || opt > ULONG_MAX / HZ)
                        return -EINVAL;
                rose->hb = opt * HZ;
                return 0;
 
        case ROSE_IDLE:
-               if (opt < 0)
+               if (opt < 0 || opt > ULONG_MAX / HZ)
                        return -EINVAL;
                rose->idle = opt * 60 * HZ;
                return 0;
-- 
2.7.4