From 32288eb4d940b10e40c6d4178fe3a40d1437d2f8 Mon Sep 17 00:00:00 2001 From: Xi Wang Date: Tue, 27 Dec 2011 09:44:53 +0000 Subject: [PATCH] netrom: avoid overflows in nr_setsockopt() Check setsockopt arguments to avoid overflows and return -EINVAL for too large arguments. Signed-off-by: Xi Wang Signed-off-by: David S. Miller --- net/netrom/af_netrom.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index c329b474eace..7dab229bfbcc 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -306,26 +306,26 @@ static int nr_setsockopt(struct socket *sock, int level, int optname, { struct sock *sk = sock->sk; struct nr_sock *nr = nr_sk(sk); - int opt; + unsigned long opt; if (level != SOL_NETROM) 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) { case NETROM_T1: - if (opt < 1) + if (opt < 1 || opt > ULONG_MAX / HZ) return -EINVAL; nr->t1 = opt * HZ; return 0; case NETROM_T2: - if (opt < 1) + if (opt < 1 || opt > ULONG_MAX / HZ) return -EINVAL; nr->t2 = opt * HZ; return 0; @@ -337,13 +337,13 @@ static int nr_setsockopt(struct socket *sock, int level, int optname, return 0; case NETROM_T4: - if (opt < 1) + if (opt < 1 || opt > ULONG_MAX / HZ) return -EINVAL; nr->t4 = opt * HZ; return 0; case NETROM_IDLE: - if (opt < 0) + if (opt > ULONG_MAX / (60 * HZ)) return -EINVAL; nr->idle = opt * 60 * HZ; return 0;