kho: fix out-of-bounds access of vmalloc chunk

The list of pages in a vmalloc chunk is NULL-terminated.  So when looping
through the pages in a vmalloc chunk, both kho_restore_vmalloc() and
kho_vmalloc_unpreserve_chunk() rightly make sure to stop when encountering
a NULL page.  But when the chunk is full, the loops do not stop and go
past the bounds of chunk->phys, resulting in out-of-bounds memory access,
and possibly the restoration or unpreservation of an invalid page.

Fix this by making sure the processing of chunk stops at the end of the
array.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: a667300bd53f ("kho: add support for preserving vmalloc allocations")
Signed-off-by: Pratyush Yadav <[email protected]>
Reviewed-by: Mike Rapoport (Microsoft) <[email protected]>
Cc: Alexander Graf <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Pasha Tatashin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions