mm: fix faulty initialization in vmalloc_init()

The transfer of ->flags causes some of the static mapping virtual
addresses to be prematurely freed (before the mapping is removed) because
VM_LAZY_FREE gets "set" if tmp->flags has VM_IOREMAP set.  This might
cause subsequent vmalloc/ioremap calls to fail because it might allocate
one of the freed virtual address ranges that aren't unmapped.

va->flags has different types of flags from tmp->flags.  If a region with
VM_IOREMAP set is registered with vm_area_add_early(), it will be removed
by __purge_vmap_area_lazy().

Fix vmalloc_init() to correctly initialize vmap_area for the given
vm_struct.

Also initialise va->vm.  If it is not set, find_vm_area() for the early
vm regions will always fail.

Signed-off-by: KyongHo Cho <pullip.cho@samsung.com>
Cc: "Olav Haugan" <ohaugan@codeaurora.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c28b0b9e5cc0..2aad49981b57 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1185,9 +1185,10 @@ void __init vmalloc_init(void)
         /* Import existing vmlist entries. */
         for (tmp = vmlist; tmp; tmp = tmp->next) {
                 va = kzalloc(sizeof(struct vmap_area), GFP_NOWAIT);
-                va->flags = tmp->flags | VM_VM_AREA;
+                va->flags = VM_VM_AREA;
                 va->va_start = (unsigned long)tmp->addr;
                 va->va_end = va->va_start + tmp->size;
+                va->vm = tmp;
                 __insert_vmap_area(va);
         }