tree 03ba738921cc4229c374c91aab18254515e8c9cf
parent 514e250f67d2b2a8ab08dc9c3650af19a411c926
author Andre Przywara <andre.przywara@linaro.org> 1368052086 +0200
committer Christoffer Dall <christoffer.dall@linaro.org> 1369923426 -0700

ARM: KVM: prevent NULL pointer dereferences with KVM VCPU ioctl

Some ARM KVM VCPU ioctls require the vCPU to be properly initialized
with the KVM_ARM_VCPU_INIT ioctl before being used with further
requests. KVM_RUN checks whether this initialization has been
done, but other ioctls do not.
Namely KVM_GET_REG_LIST will dereference an array with index -1
without initialization and thus leads to a kernel oops.
Fix this by adding checks before executing the ioctl handlers.

 [ Removed superflous comment from static function - Christoffer ]

Changes from v1:
 * moved check into a static function with a meaningful name

Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>