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Kent Overstreet 2cdcf6481c mm/filemap: fix infinite loop in generic_file_buffered_read() 
commit 3644e2d2dda78e21edd8f5415b6d7ab03f5f54f3 upstream.

If iter->count is 0 and iocb->ki_pos is page aligned, this causes
nr_pages to be 0.

Then in generic_file_buffered_read_get_pages() find_get_pages_contig()
returns 0 - because we asked for 0 pages, so we call
generic_file_buffered_read_no_cached_page() which attempts to add a page
to the page cache, which fails with -EEXIST, and then we loop. Oops...

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Reported-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Suraj Jitindar Singh <surajjs@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-23 11:01:10 +02:00
..
kasan
panic: Consolidate open-coded panic_on_warn checks
2023-02-01 08:23:20 +01:00
backing-dev.c
writeback, cgroup: remove extra percpu_ref_exit()
2023-05-30 12:57:56 +01:00
balloon_compaction.c
…
cleancache.c
…
cma_debug.c
debugfs: make sure we can remove u32_array files cleanly
2020-07-10 13:54:00 -07:00
cma.c
cma: don't quit at first error when activating reserved areas
2020-08-12 10:57:57 -07:00
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, compaction: fix fast_isolate_around() to stay within boundaries
2023-01-14 10:16:27 +01:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable: remove pte entry from the page table
2022-02-08 18:30:35 +01:00
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
mm/filemap: fix infinite loop in generic_file_buffered_read()
2023-09-23 11:01:10 +02:00
frame_vector.c
v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails
2022-12-08 11:24:00 +01:00
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/migration: return errno when isolate_huge_page failed
2023-02-15 17:22:21 +01:00
highmem.c
mm/highmem.c: clean up endif comments
2020-10-16 11:11:18 -07:00
hmm.c
mm/hmm.c: allow VM_MIXEDMAP to work with hmm_range_fault
2022-01-27 10:54:36 +01:00
huge_memory.c
mm/userfaultfd: propagate uffd-wp bit when PTE-mapping the huge zeropage
2023-03-22 13:30:04 +01:00
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
mm/migration: return errno when isolate_huge_page failed
2023-02-15 17:22:21 +01:00
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
2020-12-30 11:53:54 +01:00
internal.h
mm/thp: fix vma_address() if virtual address below file offset
2021-06-30 08:47:27 -04:00
interval_tree.c
…
ioremap.c
mm: move p?d_alloc_track to separate header file
2020-08-07 11:33:26 -07:00
Kconfig
mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING
2020-12-06 10:19:07 -08:00
Kconfig.debug
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
khugepaged.c
mm/khugepaged: check again on anon uffd-wp during isolation
2023-04-26 11:27:38 +02:00
kmemleak.c
Revert "mm: kmemleak: take a full lowmem check in kmemleak_*_phys()"
2022-09-15 11:32:02 +02:00
ksm.c
ksm: fix potential missing rmap_item for stable_node
2021-05-19 10:13:07 +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
maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault()
2022-11-25 17:45:53 +01:00
madvise.c
mm: fix madivse_pageout mishandling on non-LRU page
2022-10-05 10:38:40 +02:00
Makefile
mm,kmemleak-test.c: move kmemleak-test.c to samples dir
2020-10-13 18:38:27 -07:00
mapping_dirty_helpers.c
…
memblock.c
Revert "mm: Always release pages to the buddy allocator in memblock_free_late()."
2023-02-22 12:55:56 +01:00
memcontrol.c
mm: memcontrol: deprecate charge moving
2023-03-11 16:40:04 +01:00
memfd.c
memfd: check for non-NULL file_seals in memfd_create() syscall
2023-06-28 10:28:09 +02:00
memory_hotplug.c
mm/memory_hotplug: extend offline_and_remove_memory() to handle more than one memory block
2023-06-21 15:45:40 +02:00
memory-failure.c
mm,hwpoison: fix printing of page flags
2023-08-30 16:23:20 +02:00
memory.c
mm/memory: add non-anonymous page check in the copy_present_page()
2022-11-03 23:57:50 +09:00
mempolicy.c
migrate: hugetlb: check for hugetlb shared PMD in node migration
2023-02-15 17:22:21 +01:00
mempool.c
mm/mempool: add 'else' to split mutually exclusive case
2020-10-13 18:38:34 -07:00
memremap.c
mm/memremap.c: map FS_DAX device memory as decrypted
2022-11-16 09:57:17 +01:00
memtest.c
…
migrate.c
mm/migration: return errno when isolate_huge_page failed
2023-02-15 17:22:21 +01:00
mincore.c
mm: factor find_get_incore_page out of mincore_page
2020-10-13 18:38:29 -07:00
mlock.c
mlock: fix unevictable_pgs event counts on THP
2020-09-19 13:13:38 -07:00
mm_init.c
mm: adjust vm_committed_as_batch according to vm overcommit policy
2020-08-07 11:33:26 -07:00
mmap.c
mm/mmap: undo ->mmap() when arch_validate_flags() fails
2022-10-26 13:25:11 +02:00
mmu_gather.c
mm/khugepaged: fix GUP-fast interaction by sending IPI
2022-12-14 11:31:55 +01:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-27 13:53:54 +02:00
mmzone.c
arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
2022-05-15 20:00:09 +02:00
mprotect.c
mm: don't try to NUMA-migrate COW pages that have other uses
2022-02-23 12:00:57 +01:00
mremap.c
mm/mremap: hold the rmap lock in write mode when moving page table entries.
2022-08-21 15:15:21 +02:00
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: remove alloc_vm_area
2020-10-18 09:27:10 -07:00
oom_kill.c
oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup
2022-04-27 13:53:54 +02:00
page_alloc.c
mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock
2023-05-17 11:48:19 +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
mm/page_ext.c: drop pfn_present() check when onlining
2020-04-07 10:43:40 -07:00
page_idle.c
mm/page_idle.c: skip offline pages
2020-06-08 11:05:55 -07:00
page_io.c
mm: fix unexpected zeroed page mapping with zram swap
2022-04-20 09:23:25 +02:00
page_isolation.c
mm: rename page_order() to buddy_order()
2020-10-16 11:11:19 -07:00
page_owner.c
mm: rename page_order() to buddy_order()
2020-10-16 11:11:19 -07:00
page_poison.c
mm/page_poison.c: replace bool variable with static key
2020-10-16 11:11:17 -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/thp: another PVMW_SYNC fix in page_vma_mapped_walk()
2021-06-30 08:47:29 -04:00
page-writeback.c
mm: make wait_on_page_writeback() wait for multiple pending writebacks
2021-01-12 20:18:22 +01:00
pagewalk.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-08 11:11:38 +02:00
percpu-internal.h
percpu: make pcpu_nr_empty_pop_pages per chunk type
2021-04-14 08:42:03 +02:00
percpu-km.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu-stats.c
percpu: make pcpu_nr_empty_pop_pages per chunk type
2021-04-14 08:42:03 +02:00
percpu-vm.c
mm: memcg/percpu: account percpu memory to memory cgroups
2020-08-12 10:57:55 -07:00
percpu.c
percpu: make pcpu_nr_empty_pop_pages per chunk type
2021-04-14 08:42:03 +02:00
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/thp: fix __split_huge_pmd_locked() on shmem migration entry
2021-06-30 08:47:26 -04:00
process_vm_access.c
mm/process_vm_access.c: include compat.h
2021-01-19 18:27:21 +01:00
ptdump.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-08 11:11:38 +02:00
readahead.c
mm: use limited read-ahead to satisfy read
2020-10-17 13:49:08 -06:00
rmap.c
mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse
2022-09-05 10:28:56 +02:00
rodata_test.c
mm/rodata_test.c: fix missing function declaration
2020-08-21 09:52:53 -07:00
shmem.c
tmpfs: verify {g,u}id mount options correctly
2023-09-19 12:20:06 +02:00
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
mm/slub: fix redzoning for small allocations
2021-06-23 14:42:54 +02:00
slab.c
mm/sl?b.c: remove ctor argument from kmem_cache_flags
2021-05-14 09:50:45 +02:00
slab.h
mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag
2021-11-26 10:39:19 +01:00
slob.c
mm: memcg: convert vmstat slab counters to bytes
2020-08-07 11:33:24 -07:00
slub.c
mm/slub: fix to return errno if kmalloc() fails
2022-09-28 11:10:28 +02:00
sparse-vmemmap.c
mm/sparse: only sub-section aligned range would be populated
2020-08-07 11:33:27 -07:00
sparse.c
mm/sparse: add the missing sparse_buffer_fini() in error branch
2021-05-14 09:50:45 +02:00
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: swap: get rid of livelock in swapin readahead
2022-03-23 09:13:27 +01:00
swap.c
mm: move call to compound_head() in release_pages()
2020-10-13 18:38:33 -07:00
swapfile.c
mm/swap: fix swap_info_struct race between swapoff and get_swap_pages()
2023-04-20 12:10:24 +02:00
truncate.c
mm/thp: unmap_mapping_page() to fix THP truncate_cleanup_page()
2021-06-30 08:47:27 -04:00
usercopy.c
mm/usercopy: return 1 from hardened_usercopy __setup() handler
2022-04-08 14:40:43 +02:00
userfaultfd.c
mm: userfaultfd: fix missing cache flush in mcopy_atomic_pte() and __mcopy_atomic()
2022-05-15 20:00:09 +02:00
util.c
mm: Add kvrealloc()
2022-08-21 15:15:21 +02:00
vmacache.c
kernel: better document the use_mm/unuse_mm API contract
2020-06-10 19:14:18 -07:00
vmalloc.c
mm: add a call to flush_cache_vmap() in vmap_pfn()
2023-08-30 16:23:14 +02:00
vmpressure.c
…
vmscan.c
mm: vmscan: fix extreme overreclaim and swap floods
2022-12-02 17:40:04 +01:00
vmstat.c
arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
2022-05-15 20:00:09 +02:00
workingset.c
XArray updates for 5.9
2020-10-20 14:39:37 -07:00
z3fold.c
mm/z3fold: use release_z3fold_page_locked() to release locked z3fold page
2021-07-14 16:56:51 +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
zsmalloc: fix races between asynchronous zspage free and page migration
2022-06-06 08:42:43 +02:00
zswap.c
mm/zswap: allow setting default status, compressor and allocator in Kconfig
2020-04-07 10:43:41 -07:00