The patch titled
mm: don't touch uninitialized variable in do_pages_stat_array()
has been added to the -mm tree. Its filename is
mm-dont-touch-uninitialized-variable-in-do_pages_stat_array.patch
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------------------------------------------------------
Subject: mm: don't touch uninitialized variable in do_pages_stat_array()
From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
80bba1290ab5122c60cdb73332b26d288dc8aedd ("mm: no get_user/put_user while
holding mmap_sem in do_pages_stat?") removed one necessary variable
initialization. Then, following warning happend.
CC mm/migrate.o
mm/migrate.c: In function 'sys_move_pages':
mm/migrate.c:1001: warning: 'err' may be used uninitialized in this function
More unfortunately, if find_vma() failed, kernel read uninitialized memory.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Brice Goglin <Brice.Goglin@xxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/migrate.c~mm-dont-touch-uninitialized-variable-in-do_pages_stat_array mm/migrate.c
--- a/mm/migrate.c~mm-dont-touch-uninitialized-variable-in-do_pages_stat_array
+++ a/mm/migrate.c
@@ -998,7 +998,7 @@ static void do_pages_stat_array(struct m
unsigned long addr = (unsigned long)(*pages);
struct vm_area_struct *vma;
struct page *page;
- int err;
+ int err = -EFAULT;
vma = find_vma(mm, addr);
if (!vma)
_
Patches currently in -mm which might be from kosaki.motohiro@xxxxxxxxxxxxxx are
mm-dont-touch-uninitialized-variable-in-do_pages_stat_array.patch
linux-next.patch
mm-report-the-pagesize-backing-a-vma-in-proc-pid-smaps.patch
mm-report-the-mmu-pagesize-in-proc-pid-smaps.patch
oom-fix-zone_scan_mutex-name.patch
mm-get-rid-of-pagevec_release_nonlru.patch
cleanup-get-rid-of-ifdef-config_migration.patch
mm-more-likely-reclaim-madv_sequential-mappings.patch
mm-make-page_lock_anon_vma-static.patch
memcg-reclaim-shouldnt-change-zone-recent_rotated-statistics.patch
mm-make-init_section_page_cgroup-static.patch
mm-make-maddr-__iomem.patch
mm-make-mem_cgroup_resize_limit-static.patch
mm-make-scan_all_zones_unevictable_pages-static.patch
mm-make-scan_zone_unevictable_pages-static.patch
mm-make-setup_per_zone_inactive_ratio-static.patch
mm-make-vread-and-vwrite-declaration.patch
vmscan-bail-out-of-direct-reclaim-after-swap_cluster_max-pages.patch
vmscan-improve-reclaim-throughput-to-bail-out-patch.patch
mm-kill-zone_is_near_oom.patch
mm-make-get_user_pages-interruptible.patch
mm-make-get_user_pages-interruptible-mmotm-ignore-sigkill-in-get_user_pages-during-munlock.patch
introduce-get_mm_hiwater_xxx-fix-taskstats-hiwater_xxx-accounting.patch
remove-linux-hardirqh-from-asm-generic-localh-add-include-linux-irqflagsh-to-acpi-processor_idlec.patch
softirq-introduce-statistics-for-softirq.patch
proc-export-statistics-for-softirq-to-proc.patch
proc-update-document-for-proc-softirqs-and-proc-stat.patch
devices-cgroup-allow-mkfifo.patch
memcg-new-force_empty-to-free-pages-under-group-fix.patch
memcg-new-force_empty-to-free-pages-under-group-fix-fix.patch
memcg-revert-gfp-mask-fix.patch
memcg-check-group-leader-fix.patch
memcg-memoryswap-controller-fix-limit-check.patch
memcg-swapout-refcnt-fix.patch
memcg-hierarchy-avoid-unnecessary-reclaim.patch
inactive_anon_is_low-move-to-vmscan.patch
mm-introduce-zone_reclaim-struct.patch
mm-add-zone-nr_pages-helper-function.patch
mm-make-get_scan_ratio-safe-for-memcg.patch
memcg-add-null-check-to-page_cgroup_zoneinfo.patch
memcg-add-inactive_anon_is_low.patch
memcg-add-inactive_anon_is_low-vmscan-style-cleanup.patch
memcg-add-mem_cgroup_zone_nr_pages.patch
memcg-add-zone_reclaim_stat.patch
memcg-add-zone_reclaim_stat-reclaim-stat-trivial-fixes.patch
memcg-remove-mem_cgroup_cal_reclaim.patch
memcg-show-reclaim-stat.patch
memcg-rename-scan-global-lru.patch
memcg-protect-prev_priority.patch
memcg-swappiness.patch
memcg-fix-calclation-of-active_ratio.patch
memcg-fix-calclation-of-active_ratio-build-error-fix.patch
memcg-show-real-limit-under-hierarchy-mode.patch
memcg-explain-details-and-test-document.patch
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