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5d5d19eda6
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Miaohe Lin 5d5d19eda6 mm/rmap: fix potential pte_unmap on an not mapped pte 
For PMD-mapped page (usually THP), pvmw->pte is NULL.  For PTE-mapped THP,
pvmw->pte is mapped.  But for HugeTLB pages, pvmw->pte is not mapped and
set to the relevant page table entry.  So in page_vma_mapped_walk_done(),
we may do pte_unmap() for HugeTLB pte which is not mapped.  Fix this by
checking pvmw->page against PageHuge before trying to do pte_unmap().

Link: https://lkml.kernel.org/r/20210127093349.39081-1-linmiaohe@huawei.com
Fixes: ace71a19ce ("mm: introduce page_vma_mapped_walk()")
Signed-off-by: Hongxiang Lou <louhongxiang@huawei.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michel Lespinasse <walken@google.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Brian Geffon <bgeffon@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-02-26 09:41:01 -08:00
..
acpi IOMMU Updates for Linux v5.12 2021-02-22 10:31:29 -08:00
asm-generic Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
clocksource
crypto Keyrings miscellany 2021-02-23 16:09:23 -08:00
drm - WARN if plane src coords are too big (Ville) 2021-02-04 12:57:28 +10:00
dt-bindings Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
keys
kunit
kvm
linux mm/rmap: fix potential pte_unmap on an not mapped pte 2021-02-26 09:41:01 -08:00
math-emu
media Fixes around VM_FPNMAP and follow_pfn 2021-02-22 17:45:02 -08:00
memory
misc
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2021-02-17 13:19:24 -08:00
pcmcia
ras
rdma RDMA/ipoib: Remove racy Subnet Manager sendonly join checks 2021-02-16 14:42:58 -04:00
scsi
soc IOMMU Updates for Linux v5.12 2021-02-22 10:31:29 -08:00
sound ASoC: Updates for v5.12 2021-02-17 21:16:27 +01:00
target
trace mm/swap.c: don't pass "enum lru_list" to trace_mm_lru_insertion() 2021-02-24 13:38:33 -08:00
uapi Merge branch 'akpm' (patches from Andrew) 2021-02-24 16:20:38 -08:00
vdso
video
xen x86: 2021-02-21 13:31:43 -08:00