[LU-3282] copy_and_ioctl() uses wrong pointer in call to obd_iocontrol()

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.5.0
• Affects Version/s: Lustre 2.4.0
• Labels: clang llite sparse
• Severity: 3
• Assignee: John Hammond
• Reporter: John Hammond

Description

In copy_and_ioctl() the userspace pointer is diligently copied in to kernel space but then passed to obd_iocontrol() as the karg pointer. This creates a minor DoS.