diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2013-08-15 15:52:57 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-14 05:50:48 -0700 |
| commit | 7d2754c66e451ac82fd5e93bdb715e59c4bfdb02 (patch) | |
| tree | 950bed67c268dea41268f34d4319ba1dfba5f0af /drivers | |
| parent | 24e6771d4fce7c77b2569fa33131c871a2c5642e (diff) | |
tun: signedness bug in tun_get_user()
[ Upstream commit 15718ea0d844e4816dbd95d57a8a0e3e264ba90e ]
The recent fix d9bf5f1309 "tun: compare with 0 instead of total_len" is
not totally correct. Because "len" and "sizeof()" are size_t type, that
means they are never less than zero.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/tun.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 28c5c6a31b7..476b2edd267 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -614,8 +614,9 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, int offset = 0; if (!(tun->flags & TUN_NO_PI)) { - if ((len -= sizeof(pi)) > count) + if (len < sizeof(pi)) return -EINVAL; + len -= sizeof(pi); if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) return -EFAULT; @@ -623,8 +624,9 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, } if (tun->flags & TUN_VNET_HDR) { - if ((len -= tun->vnet_hdr_sz) > count) + if (len < tun->vnet_hdr_sz) return -EINVAL; + len -= tun->vnet_hdr_sz; if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) return -EFAULT; |