staging: lustre: check for integer overflow
staging: lustre: check for integer overflow

In ll_ioctl_fiemap(), a user-supplied value is used to calculate a
length of a buffer which is later allocated with user data.

Signed-off-by: Vitaly Osipov <35ffa2aca6b493b079c9c39f63394c920e6d234a@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs