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09eafb2817274145e936cc918c82288a3bc09cb3
linux/mm
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Axel Rasmussen 02732576b1 FROMLIST: userfaultfd/shmem: fix minor fault page leak 
This fix is analogous to Peter Xu's fix for hugetlb [0]. If we don't
put_page() after getting the page out of the page cache, we leak the
reference.

The fix can be verified by checking /proc/meminfo and running the
userfaultfd selftest in shmem mode. Without the fix, we see MemFree /
MemAvailable steadily decreasing with each run of the test. With the
fix, memory is correctly freed after the test program exits.

Fixes: 00da60b9d0a0 ("userfaultfd: support minor fault handling for shmem")
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>

Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Link: https://lore.kernel.org/patchwork/patch/1400686/
Bug: 160737021
Bug: 169683130
Change-Id: I599f1434e24fce6e31d0d73c7f9c4714e9875b63
2021-04-09 15:36:02 -07:00
..
kasan
FROMGIT: kasan: record task_work_add() call stack
2021-03-24 15:09:18 -07:00
kfence
UPSTREAM: kfence: report sensitive information based on no_hash_pointers
2021-03-01 18:11:05 +01:00
backing-dev.c
bdi: replace BDI_CAP_NO_{WRITEBACK,ACCT_DIRTY} with a single flag
2020-09-24 13:43:39 -06:00
balloon_compaction.c
…
cleancache.c
…
cma_debug.c
FROMLIST: mm: cma: introduce gfp flag in cma_alloc instead of no_warn
2021-01-25 12:21:02 -08:00
cma_sysfs.c
ANDROID: make cma_sysfs experimental
2021-03-25 19:20:18 +00:00
cma.c
ANDROID: mm: cma: add vendor hoook in cma_alloc()
2021-04-06 20:01:19 +00:00
cma.h
FROMLIST: mm: cma: support sysfs
2021-03-25 19:20:09 +00:00
compaction.c
FROMLIST: mm: replace migrate_[prep|finish] with lru_cache_[disable|enable]
2021-03-23 04:05:24 +00:00
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, dump_page: rename head_mapcount() --> head_compound_mapcount()
2020-10-13 18:38:29 -07:00
dmapool.c
mm/dmapool.c: replace hard coded function name with __func__
2020-10-13 18:38:32 -07:00
early_ioremap.c
…
fadvise.c
mm, fadvise: improve the expensive remote LRU cache draining after FADV_DONTNEED
2020-10-13 18:38:29 -07:00
failslab.c
…
filemap.c
ANDROID: mm: Add vendor hook in pagecache_get_page()
2021-02-19 17:59:52 +00:00
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_benchmark.c
mm/gup_benchmark: take the mmap lock around GUP
2020-10-18 09:27:09 -07:00
gup.c
mm/gup: combine put_compound_head() and unpin_user_page()
2020-12-30 11:53:54 +01:00
highmem.c
mm/highmem.c: clean up endif comments
2020-10-16 11:11:18 -07:00
hmm.c
mm: do page fault accounting in handle_mm_fault
2020-08-12 10:58:02 -07:00
huge_memory.c
Merge 5.10.27 into android12-5.10
2021-04-02 15:25:50 +02:00
hugetlb_cgroup.c
hugetlb_cgroup: fix imbalanced css_get and css_put pair for shared mappings
2021-03-30 14:31:54 +02:00
hugetlb.c
FROMLIST: userfaultfd/hugetlbfs: Fix minor fault page leak
2021-04-09 15:36:01 -07:00
hwpoison-inject.c
mm,hwpoison-inject: don't pin for hwpoison_filter
2020-10-16 11:11:16 -07:00
init-mm.c
FROMLIST: mm: protect mm_rb tree with a rwlock
2021-01-22 18:00:57 +00:00
internal.h
FROMLIST: mm: provide speculative fault infrastructure
2021-01-22 18:01:16 +00:00
interval_tree.c
…
ioremap.c
mm: move p?d_alloc_track to separate header file
2020-08-07 11:33:26 -07:00
Kconfig
FROMLIST: mm: cma: support sysfs
2021-03-25 19:20:09 +00:00
Kconfig.debug
FROMGIT: mm, page_poison: remove CONFIG_PAGE_POISONING_ZERO
2021-03-24 15:09:17 -07:00
khugepaged.c
Merge 5.10.20 into android12-5.10
2021-03-07 12:33:33 +01:00
kmemleak.c
mm/kmemleak: rely on rcu for task stack scanning
2020-10-13 18:38:27 -07:00
ksm.c
docs: get rid of :c:type explicit declarations for structs
2020-10-15 07:49:40 +02:00
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
Merge 5.10.24 into android12-5.10-lts
2021-03-19 09:42:56 +01:00
Makefile
FROMLIST: mm: cma: support sysfs
2021-03-25 19:20:09 +00:00
mapping_dirty_helpers.c
…
memblock.c
Merge 5.10.15 into android12-5.10
2021-02-10 09:53:50 +01:00
memcontrol.c
mm/memcg: fix 5.10 backport of splitting page memcg
2021-03-30 14:32:07 +02:00
memfd.c
…
memory_hotplug.c
FROMGIT: mm: introduce debug_pagealloc_{map,unmap}_pages() helpers
2021-03-24 15:09:17 -07:00
memory-failure.c
mm: fix memory_failure() handling of dax-namespace metadata
2021-03-04 11:38:21 +01:00
memory.c
BACKPORT: FROMGIT: userfaultfd: support minor fault handling for shmem
2021-04-09 15:36:00 -07:00
mempolicy.c
FROMLIST: mm: replace migrate_[prep|finish] with lru_cache_[disable|enable]
2021-03-23 04:05:24 +00:00
mempool.c
FROMGIT: kasan, mm: integrate page_alloc init with HW_TAGS
2021-03-24 15:09:18 -07:00
memremap.c
mm: fix memory_failure() handling of dax-namespace metadata
2021-03-04 11:38:21 +01:00
memtest.c
…
migrate.c
FROMLIST: mm: replace migrate_[prep|finish] with lru_cache_[disable|enable]
2021-03-23 04:05:24 +00:00
mincore.c
mm: factor find_get_incore_page out of mincore_page
2020-10-13 18:38:29 -07:00
mlock.c
FROMLIST: mm: protect VMA modifications using VMA sequence count
2021-01-22 17:59:47 +00:00
mm_init.c
mm: adjust vm_committed_as_batch according to vm overcommit policy
2020-08-07 11:33:26 -07:00
mmap.c
ANDROID: mm: use raw seqcount variants in vm_write_*
2021-01-22 18:02:43 +00:00
mmu_gather.c
mmap locking API: convert mmap_sem comments
2020-06-09 09:39:14 -07:00
mmu_notifier.c
mm/mmu_notifiers: ensure range_end() is paired with range_start()
2021-03-30 14:32:06 +02:00
mmzone.c
ANDROID: mm: export zone_watermark_ok
2021-02-25 19:36:38 +00:00
mprotect.c
FROMLIST: mm: protect VMA modifications using VMA sequence count
2021-01-22 17:59:47 +00:00
mremap.c
FROMLIST: mm: Extend MREMAP_DONTUNMAP to non-anonymous mappings
2021-03-25 22:44:44 +00:00
msync.c
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
2020-06-09 09:39:14 -07:00
nommu.c
BACKPORT: FROMGIT: mm/nommu: Fix return type of filemap_map_pages()
2021-02-11 12:15:58 +00:00
oom_kill.c
ANDROID: mm, oom: Prevent extra put_task when oom_evaluate_task is aborted
2021-02-24 22:21:44 +00:00
OWNERS
ANDROID: Add OWNERS files referring to the respective android-mainline OWNERS
2021-04-03 14:11:30 +00:00
page_alloc.c
Merge 5.10.27 into android12-5.10
2021-04-02 15:25:50 +02:00
page_counter.c
mm/page_counter: correct the obsolete func name in the comment of page_counter_try_charge()
2020-10-13 18:38:30 -07:00
page_ext.c
ANDROID: mm: Export lookup_page_ext
2021-01-06 16:16:41 +00:00
page_idle.c
mm/page_idle.c: skip offline pages
2020-06-08 11:05:55 -07:00
page_io.c
UPSTREAM: mm/page_io: use pr_alert_ratelimited for swap read/write errors
2021-03-30 18:44:11 +00:00
page_isolation.c
mm: rename page_order() to buddy_order()
2020-10-16 11:11:19 -07:00
page_owner.c
ANDROID: mm: Make page_owner_enabled global
2021-04-01 00:09:00 +00:00
page_poison.c
FROMGIT: mm, page_poison: remove CONFIG_PAGE_POISONING_NO_SANITY
2021-03-24 15:09:17 -07:00
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: replace hpage_nr_pages with thp_nr_pages
2020-08-14 19:56:56 -07:00
page-writeback.c
mm: make wait_on_page_writeback() wait for multiple pending writebacks
2021-01-12 20:18:22 +01:00
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
ANDROID: mm: Export pcpu_nr_pages
2021-01-11 20:27:24 +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.c: include compat.h
2021-01-19 18:27:21 +01:00
ptdump.c
BACKPORT: kasan, arm64: expand CONFIG_KASAN checks
2021-01-19 21:47:30 -08:00
readahead.c
ANDROID: mm: Create vendor hooks to control ZONE_MOVABLE allocations
2020-12-01 18:07:54 +00:00
rmap.c
FROMLIST: mm: introduce __page_add_new_anon_rmap()
2021-01-22 18:00:48 +00:00
rodata_test.c
mm/rodata_test.c: fix missing function declaration
2020-08-21 09:52:53 -07:00
shmem.c
FROMLIST: userfaultfd/shmem: fix minor fault page leak
2021-04-09 15:36:02 -07:00
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
ANDROID: vendor_hooks: Add hooks for memory when debug
2021-03-19 04:54:07 +00:00
slab.c
FROMGIT: kasan, mm: integrate slab init_on_free with HW_TAGS
2021-03-24 15:09:18 -07:00
slab.h
ANDROID: mm: Make slub_debug global
2021-04-01 00:09:35 +00:00
slob.c
mm: memcg: convert vmstat slab counters to bytes
2020-08-07 11:33:24 -07:00
slub.c
ANDROID: mm: Make slub_debug global
2021-04-01 00:09:35 +00:00
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
…
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
FROMLIST: mm: protect VMA modifications using VMA sequence count
2021-01-22 17:59:47 +00:00
swap.c
FROMLIST: mm: fs: Invalidate BH LRU during page migration
2021-03-23 04:05:31 +00:00
swapfile.c
Merge 5.10.21 into android12-5.10
2021-03-07 12:53:30 +01:00
truncate.c
mm/truncate.c: make __invalidate_mapping_pages() static
2020-11-02 12:14:19 -08:00
usercopy.c
mm/usercopy.c: delete duplicated word
2020-08-12 10:57:58 -07:00
userfaultfd.c
BACKPORT: FROMGIT: userfaultfd: support minor fault handling for shmem
2021-04-09 15:36:00 -07:00
util.c
mm/util.c: update the kerneldoc for kstrdup_const()
2020-10-16 11:11:17 -07:00
vmacache.c
kernel: better document the use_mm/unuse_mm API contract
2020-06-10 19:14:18 -07:00
vmalloc.c
Merge 5.10.9 into android12-5.10
2021-01-19 18:49:54 +01:00
vmpressure.c
…
vmscan.c
Merge 5.10.20 into android12-5.10
2021-03-07 12:33:33 +01:00
vmstat.c
BACKPORT: FROMGIT: mm: vmstat: add cma statistics
2021-03-04 23:53:23 +00:00
workingset.c
Merge tag 'xarray-5.9' of git://git.infradead.org/users/willy/xarray
2020-10-20 14:39:37 -07:00
z3fold.c
z3fold: prevent reclaim/free race for headless pages
2021-03-30 14:31:54 +02:00
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
Merge 5.10.21 into android12-5.10
2021-03-07 12:53:30 +01:00
zswap.c
…