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Andrey Ryabinin 8b69e7ec54 mm/fadvise.c: fix signed overflow UBSAN complaint 
[ Upstream commit a718e28f538441a3b6612da9ff226973376cdf0f ]

Signed integer overflow is undefined according to the C standard.  The
overflow in ksys_fadvise64_64() is deliberate, but since it is signed
overflow, UBSAN complains:

	UBSAN: Undefined behaviour in mm/fadvise.c:76:10
	signed integer overflow:
	4 + 9223372036854775805 cannot be represented in type 'long long int'

Use unsigned types to do math.  Unsigned overflow is defined so UBSAN
will not complain about it.  This patch doesn't change generated code.

[akpm@linux-foundation.org: add comment explaining the casts]
Link: http://lkml.kernel.org/r/20180629184453.7614-1-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: <icytxw@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2019-07-27 21:51:37 +02:00
..
kasan kasan, module, vmalloc: rework shadow allocation for modules 2015-05-04 14:03:58 -07:00
Kconfig Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
Kconfig.debug
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Makefile BACKPORT: mm/zpool: implement common zpool api to zbud/zsmalloc 2016-05-18 14:35:03 +05:30
backing-dev.c
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balloon_compaction.c
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bootmem.c
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bounce.c
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cleancache.c
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compaction.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
debug-pagealloc.c mm/debug-pagealloc.c: print page physical address for 2015-08-23 23:19:22 -07:00
dmapool.c
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early_ioremap.c
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fadvise.c mm/fadvise.c: fix signed overflow UBSAN complaint 2019-07-27 21:51:37 +02:00
failslab.c
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filemap.c mm, fs: check for fatal signals in do_generic_file_read() 2019-07-27 21:43:51 +02:00
filemap_xip.c
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fremap.c
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frontswap.c
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highmem.c
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huge_memory.c mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp 2019-07-27 21:43:25 +02:00
hugetlb.c mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault 2015-10-22 14:37:50 -07:00
hugetlb_cgroup.c
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hwpoison-inject.c
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init-mm.c
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internal.h mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
interval_tree.c
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kmemcheck.c
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kmemleak-test.c
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kmemleak.c mm: kmemleak: allow safe memory scanning during kmemleak disabling 2015-06-22 10:47:32 +05:30
ksm.c mm,ksm: fix endless looping in allocating memory when ksm enable 2019-07-27 21:42:51 +02:00
maccess.c
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madvise.c mm/madvise.c: fix madvise() infinite loop under special circumstances 2019-07-27 21:45:21 +02:00
memblock.c
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memcontrol.c UPSTREAM: memcg: Only free spare array when readers are done 2016-05-18 14:36:06 +05:30
memory-failure.c This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
memory.c mm/memory.c: check return value of ioremap_prot 2019-07-27 21:51:23 +02:00
memory_hotplug.c mm/memory_hotplug.c: check start_pfn in test_pages_in_a_zone() 2019-07-27 21:43:51 +02:00
mempolicy.c mm/mempolicy.c: avoid use uninitialized preferred_node 2019-07-27 21:49:27 +02:00
mempool.c
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memtest.c memtest: use phys_addr_t for physical addresses 2015-04-01 09:27:43 -07:00
migrate.c Sanitize 'move_pages()' permission checks 2019-07-27 21:44:50 +02:00
mincore.c
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mlock.c mm: reorder can_do_mlock to fix audit denial 2015-09-16 18:20:13 +05:30
mm_init.c
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mmap.c mm/mmap.c: do not blow on PROT_NONE MAP_FIXED holes in the stack 2019-07-27 21:44:55 +02:00
mmu_context.c
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mmu_notifier.c
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mmzone.c
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mprotect.c mm/mprotect: add a cond_resched() inside change_pmd_range() 2019-07-27 21:46:25 +02:00
mremap.c
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msync.c
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nobootmem.c
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nommu.c This is the 3.10.73 stable release 2015-04-24 18:14:57 -07:00
oom_kill.c This is the 3.10.67 stable release 2015-04-24 18:04:40 -07:00
page-writeback.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_alloc.c mm: fix cma accounting in zone_watermark_ok 2019-07-27 21:51:09 +02:00
page_cgroup.c
…
page_io.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_isolation.c mm: add zone counter for cma pages 2019-07-27 21:51:09 +02:00
pageowner.c
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pagewalk.c
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percpu-km.c
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percpu-vm.c
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percpu.c
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pgtable-generic.c
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process_reclaim.c lowmemorykiller: Introduce sysfs node for ALMK and PPR adj threshold 2016-07-06 23:07:02 -07:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
quicklist.c
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readahead.c readahead: make context readahead more conservative 2019-07-27 21:49:54 +02:00
rmap.c mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
shmem.c tmpfs: fix regression hang in fallocate undo 2019-07-27 21:41:47 +02:00
showmem.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
slab.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2019-07-27 21:44:59 +02:00
slab.h
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slab_common.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
slob.c
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slub.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
sparse-vmemmap.c
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sparse.c
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swap.c
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swap_state.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
swapfile.c swapfile: fix memory corruption via malformed swapfile 2019-07-27 21:42:14 +02:00
truncate.c
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util.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmpressure.c mm: vmpressure: fix sending wrong events on underflow 2019-07-27 21:43:56 +02:00
vmscan.c mm: fix the NULL mapping case in __isolate_lru_page() 2019-07-27 21:49:37 +02:00
vmstat.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zbud.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zpool.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zsmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zswap.c Import latest Samsung release 2017-04-18 03:43:52 +02:00