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| author | Jerome Marchand <jmarchan@redhat.com> | 2015-11-21 00:57:02 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-21 01:17:32 +0100 |
| commit | 7511c3ede752e6dd67df20779b4e11effe102637 (patch) | |
| tree | a3ec206ac3a6816a803d2a793dcbe86ca2f041ee | |
| parent | tools/vm/page-types.c: support KPF_IDLE (diff) | |
| download | linux-7511c3ede752e6dd67df20779b4e11effe102637.tar.xz linux-7511c3ede752e6dd67df20779b4e11effe102637.zip | |
mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()
Commit 71394fe50146 ("mm: vmalloc: add flag preventing guard hole
allocation") missed a spot. Currently remove_vm_area() decreases vm->size
to "remove" the guard hole page, even when it isn't present. All but one
users just free the vm_struct rigth away and never access vm->size anyway.
Don't touch the size in remove_vm_area() and have __vunmap() use the
proper get_vm_area_size() helper.
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/vmalloc.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d04563480c94..8e3c9c5a3042 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1443,7 +1443,6 @@ struct vm_struct *remove_vm_area(const void *addr) vmap_debug_free_range(va->va_start, va->va_end); kasan_free_shadow(vm); free_unmap_vmap_area(va); - vm->size -= PAGE_SIZE; return vm; } @@ -1468,8 +1467,8 @@ static void __vunmap(const void *addr, int deallocate_pages) return; } - debug_check_no_locks_freed(addr, area->size); - debug_check_no_obj_freed(addr, area->size); + debug_check_no_locks_freed(addr, get_vm_area_size(area)); + debug_check_no_obj_freed(addr, get_vm_area_size(area)); if (deallocate_pages) { int i; |