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| author | KyongHo <pullip.cho@samsung.com> | 2012-05-29 15:06:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-17 11:23:13 -0700 |
| commit | c201beec4842674cd4773771931d25c9a5d45d66 (patch) | |
| tree | 338e5e02fc63fd3cadfcdd4f273a02bd49c96e6d | |
| parent | 5c2d31dda012797578d012425a785d58e14d2053 (diff) | |
| download | linux-rt-c201beec4842674cd4773771931d25c9a5d45d66.tar.gz | |
mm: fix faulty initialization in vmalloc_init()
commit dbda591d920b4c7692725b13e3f68ecb251e9080 upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | mm/vmalloc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 3e927cce753d..bdb70042c123 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1174,9 +1174,10 @@ 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); } |