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Kalesh Singh e05986ee7a mm/mremap.c: fix extent calculation 
When `next < old_addr`, `next - old_addr` arithmetic underflows causing
`extent` to be incorrect.

Make `extent` the smaller of `next - old_addr` or `old_end - old_addr`.

Link: https://lkml.kernel.org/r/20201219170433.2418867-1-kaleshsingh@google.com
Fixes: c49dd34018026 ("mm: speedup mremap on 1GB or larger regions")
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-29 15:36:49 -08:00
..
kasan
kasan, mm: allow cache merging with no metadata
2020-12-22 12:55:09 -08:00
backing-dev.c
mm:backing-dev: use sysfs_emit in macro defining functions
2020-12-15 12:13:47 -08:00
balloon_compaction.c
mm/balloon_compaction: suppress allocation warnings
2019-09-04 07:42:01 -04:00
cleancache.c
Driver Core and debugfs changes for 5.3-rc1
2019-07-12 12:24:03 -07:00
cma_debug.c
debugfs: make sure we can remove u32_array files cleanly
2020-07-10 13:54:00 -07:00
cma.c
mm: cma: improve pr_debug log in cma_release()
2020-12-15 12:13:46 -08:00
cma.h
mm: cma: use CMA_MAX_NAME to define the length of cma name array
2020-09-01 09:19:43 +02:00
compaction.c
mm/lru: replace pgdat lru_lock with lruvec lock
2020-12-15 14:48:04 -08:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable: avoid doing memory allocation with pgtable_t mapped.
2020-10-16 11:11:14 -07:00
debug.c
mm: memcontrol: Use helpers to read page's memcg data
2020-12-02 18:28:05 -08:00
dmapool.c
mm/dmapool.c: replace hard coded function name with __func__
2020-10-13 18:38:32 -07:00
early_ioremap.c
mm/early_ioremap.c: use %pa to print resource_size_t variables
2020-01-31 10:30:38 -08:00
fadvise.c
mm, fadvise: improve the expensive remote LRU cache draining after FADV_DONTNEED
2020-10-13 18:38:29 -07:00
failslab.c
mm/failslab.c: by default, do not fail allocations with direct reclaim only
2019-07-12 11:05:43 -07:00
filemap.c
mm/filemap: fix infinite loop in generic_file_buffered_read()
2020-12-18 13:37:04 -08:00
frame_vector.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
frontswap.c
mm/frontswap: mark various intentional data races
2020-08-14 19:56:56 -07:00
gup_test.c
mm/gup_test.c: mark gup_test_init as __init function
2020-12-15 12:13:38 -08:00
gup_test.h
selftests/vm: gup_test: introduce the dump_pages() sub-test
2020-12-15 12:13:38 -08:00
gup.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
highmem.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
hmm.c
mm: do page fault accounting in handle_mm_fault
2020-08-12 10:58:02 -07:00
huge_memory.c
mm: fix some spelling mistakes in comments
2020-12-15 22:46:19 -08:00
hugetlb_cgroup.c
hugetlb_cgroup: fix offline of hugetlb cgroup with reservations
2020-12-06 10:19:07 -08:00
hugetlb.c
mm/hugetlb: fix deadlock in hugetlb_cow error path
2020-12-29 15:36:49 -08:00
hwpoison-inject.c
mm,hwpoison-inject: don't pin for hwpoison_filter
2020-10-16 11:11:16 -07:00
init-mm.c
mm/gup: prevent gup_fast from racing with COW during fork
2020-12-15 12:13:39 -08:00
internal.h
mm, page_alloc: disable pcplists during memory offline
2020-12-15 12:13:43 -08:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
ioremap.c
mm: move p?d_alloc_track to separate header file
2020-08-07 11:33:26 -07:00
Kconfig
mm/Kconfig: fix spelling mistake "whats" -> "what's"
2020-12-19 11:25:41 -08:00
Kconfig.debug
mm, page_poison: remove CONFIG_PAGE_POISONING_ZERO
2020-12-15 12:13:46 -08:00
khugepaged.c
mm: fix some spelling mistakes in comments
2020-12-15 22:46:19 -08:00
kmemleak.c
mm/kmemleak: rely on rcu for task stack scanning
2020-10-13 18:38:27 -07:00
ksm.c
mm: cleanup kstrto*() usage
2020-12-15 12:13:47 -08:00
list_lru.c
mm: list_lru: set shrinker map bit when child nr_items is not zero
2020-12-06 10:19:07 -08:00
maccess.c
uaccess: add force_uaccess_{begin,end} helpers
2020-08-12 10:57:59 -07:00
madvise.c
mm,memory_failure: always pin the page in madvise_inject_error
2020-12-15 12:13:44 -08:00
Makefile
mm: mmap_lock: add tracepoints around lock acquisition
2020-12-15 12:13:41 -08:00
mapping_dirty_helpers.c
mm/mapping_dirty_helpers: enhance the kernel-doc markups
2020-12-15 12:13:41 -08:00
memblock.c
memblock: debug enhancements
2020-12-16 14:44:53 -08:00
memcontrol.c
mm/memcontrol:rewrite mem_cgroup_page_lruvec()
2020-12-19 11:18:37 -08:00
memfd.c
mm: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
memory_hotplug.c
mm: memmap defer init doesn't work as expected
2020-12-29 15:36:49 -08:00
memory-failure.c
mm,hwpoison: return -EBUSY when migration fails
2020-12-15 12:13:44 -08:00
memory.c
mm: simplify follow_pte{,pmd}
2020-12-15 22:46:19 -08:00
mempolicy.c
mm: migrate: clean up migrate_prep{_local}
2020-12-15 12:13:45 -08:00
mempool.c
kasan, mm: rename kasan_poison_kfree
2020-12-22 12:55:09 -08:00
memremap.c
mm/mremap_pages: fix static key devmap_managed_key updates
2020-11-02 12:14:18 -08:00
memtest.c
…
migrate.c
mm: fix some spelling mistakes in comments
2020-12-15 22:46:19 -08:00
mincore.c
mm: factor find_get_incore_page out of mincore_page
2020-10-13 18:38:29 -07:00
mlock.c
mm/lru: introduce relock_page_lruvec()
2020-12-15 14:48:04 -08:00
mm_init.c
mm: fix fall-through warnings for Clang
2020-12-15 12:13:47 -08:00
mmap_lock.c
mm: mmap_lock: add tracepoints around lock acquisition
2020-12-15 12:13:41 -08:00
mmap.c
UAPI Changes:
2020-12-18 12:38:28 -08:00
mmu_gather.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
mmu_notifier.c
mm: track mmu notifiers in fs_reclaim_acquire/release
2020-12-15 12:13:41 -08:00
mmzone.c
mm/lru: replace pgdat lru_lock with lruvec lock
2020-12-15 14:48:04 -08:00
mprotect.c
mm: Add 'mprotect' hook to struct vm_operations_struct
2020-11-17 14:36:14 +01:00
mremap.c
mm/mremap.c: fix extent calculation
2020-12-29 15:36:49 -08:00
msync.c
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
2020-06-09 09:39:14 -07:00
nommu.c
mm: cleanup: remove unused tsk arg from __access_remote_vm
2020-12-15 12:13:40 -08:00
oom_kill.c
mm/oom_kill: change comment and rename is_dump_unreclaim_slabs()
2020-12-15 12:13:45 -08:00
page_alloc.c
mm: memmap defer init doesn't work as expected
2020-12-29 15:36:49 -08:00
page_counter.c
mm/page_counter: use page_counter_read in page_counter_set_max
2020-12-15 12:13:40 -08:00
page_ext.c
mm: fix some spelling mistakes in comments
2020-12-15 22:46:19 -08:00
page_idle.c
mm: page_idle_get_page() does not need lru_lock
2020-12-15 14:48:03 -08:00
page_io.c
mm: memcontrol: Use helpers to read page's memcg data
2020-12-02 18:28:05 -08:00
page_isolation.c
mm/page_isolation: do not isolate the max order page
2020-12-15 12:13:45 -08:00
page_owner.c
mm/page_owner: record timestamp and pid
2020-12-15 12:13:38 -08:00
page_poison.c
kasan, mm: reset tags when accessing metadata
2020-12-22 12:55:08 -08:00
page_reporting.c
mm: rename page_order() to buddy_order()
2020-10-16 11:11:19 -07:00
page_reporting.h
mm: introduce include/linux/pgtable.h
2020-06-09 09:39:13 -07:00
page_vma_mapped.c
mm/page_vma_mapped.c: add colon to fix kernel-doc markups error for check_pte
2020-12-15 12:13:41 -08:00
page-writeback.c
mm: fix VM_BUG_ON(PageTail) and BUG_ON(PageWriteback)
2020-11-24 15:23:19 -08:00
pagewalk.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
percpu-internal.h
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-km.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-stats.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-vm.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu.c
percpu: convert flexible array initializers to use struct_size()
2020-10-30 23:02:28 +00:00
pgalloc-track.h
mm: move p?d_alloc_track to separate header file
2020-08-07 11:33:26 -07:00
pgtable-generic.c
mm: introduce include/linux/pgtable.h
2020-06-09 09:39:13 -07:00
process_vm_access.c
mm/process_vm_access: remove redundant initialization of iov_r
2020-12-15 12:13:46 -08:00
ptdump.c
kasan, arm64: expand CONFIG_KASAN checks
2020-12-22 12:55:08 -08:00
readahead.c
mm: use limited read-ahead to satisfy read
2020-10-17 13:49:08 -06:00
rmap.c
mm/lru: revise the comments of lru_lock
2020-12-15 14:48:04 -08:00
rodata_test.c
mm/rodata_test.c: fix missing function declaration
2020-08-21 09:52:53 -07:00
shmem.c
mm: shmem: convert shmem_enabled_show to use sysfs_emit_at
2020-12-15 12:13:47 -08:00
shuffle.c
mm: rename page_order() to buddy_order()
2020-10-16 11:11:19 -07:00
shuffle.h
mm/shuffle: remove dynamic reconfiguration
2020-08-07 11:33:29 -07:00
slab_common.c
kasan, mm: allow cache merging with no metadata
2020-12-22 12:55:09 -08:00
slab.c
mm: introduce debug_pagealloc_{map,unmap}_pages() helpers
2020-12-15 12:13:43 -08:00
slab.h
Networking updates for 5.11
2020-12-15 13:22:29 -08:00
slob.c
mm: extract might_alloc() debug check
2020-12-15 12:13:41 -08:00
slub.c
kasan, mm: reset tags when accessing metadata
2020-12-22 12:55:08 -08:00
sparse-vmemmap.c
mm/sparse: only sub-section aligned range would be populated
2020-08-07 11:33:27 -07:00
sparse.c
mm/memory_hotplug: guard more declarations by CONFIG_MEMORY_HOTPLUG
2020-10-16 11:11:18 -07:00
swap_cgroup.c
mm: memcontrol: make swap tracking an integral part of memory control
2020-06-03 20:09:48 -07:00
swap_slots.c
mm/swap_slots.c: remove always zero and unused return value of enable_swap_slots_cache()
2020-10-13 18:38:30 -07:00
swap_state.c
mm: use sysfs_emit for struct kobject * uses
2020-12-15 12:13:47 -08:00
swap.c
mm/lru: introduce relock_page_lruvec()
2020-12-15 14:48:04 -08:00
swapfile.c
mm: fix a race on nr_swap_pages
2020-12-15 22:46:15 -08:00
truncate.c
mm: fix kernel-doc markups
2020-12-15 12:13:47 -08:00
usercopy.c
mm/usercopy.c: delete duplicated word
2020-08-12 10:57:58 -07:00
userfaultfd.c
mm/vmscan: protect the workingset on anonymous LRU
2020-08-12 10:57:55 -07:00
util.c
mm: introduce vma_set_file function v5
2020-11-19 10:36:36 +01:00
vmacache.c
kernel: better document the use_mm/unuse_mm API contract
2020-06-10 19:14:18 -07:00
vmalloc.c
mm/vmalloc.c: fix kasan shadow poisoning size
2020-12-15 12:13:42 -08:00
vmpressure.c
mm: vmpressure: use mem_cgroup_is_root API
2020-04-02 09:35:31 -07:00
vmscan.c
mm/lru: revise the comments of lru_lock
2020-12-15 14:48:04 -08:00
vmstat.c
arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
2020-12-15 12:13:42 -08:00
workingset.c
Merge branch 'akpm' (patches from Andrew)
2020-12-15 14:55:10 -08:00
z3fold.c
z3fold: remove preempt disabled sections for RT
2020-12-15 12:13:45 -08:00
zbud.c
mm/zbud: remove redundant initialization
2020-10-13 18:38:34 -07:00
zpool.c
mm/zpool.c: delete duplicated word and fix grammar
2020-08-12 10:57:58 -07:00
zsmalloc.c
mm/zsmalloc.c: rework the list_add code in insert_zspage()
2020-12-15 12:13:46 -08:00
zswap.c
mm/zswap: move to use crypto_acomp API for hardware acceleration
2020-12-15 12:13:46 -08:00