cifs-utils: mount.cifs incorrect fix for CVE-2010-0547

The checkmtab function in client/mount.cifs.c in mount.cifs in smbfs in Samba 3.5.10 and earlier does not properly verify that the 1 device name and 2 mountpoint strings are composed of valid characters, which allows local users to cause a denial of service mtab corruption via a crafted string...