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Date: Mon, 9 Jun 2014 17:24:27 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Andrey Ryabinin <a.ryabinin@...sung.com>, Peter Zijlstra <peterz@...radead.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: [PATCH 3.4 17/88] mm: rmap: fix use-after-free in __put_anon_vma 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrey Ryabinin <a.ryabinin@...sung.com> commit 624483f3ea82598ab0f62f1bdb9177f531ab1892 upstream. While working address sanitizer for kernel I've discovered use-after-free bug in __put_anon_vma. For the last anon_vma, anon_vma->root freed before child anon_vma. Later in anon_vma_free(anon_vma) we are referencing to already freed anon_vma->root to check rwsem. This fixes it by freeing the child anon_vma before freeing anon_vma->root. Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com> Acked-by: Peter Zijlstra <peterz@...radead.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- mm/rmap.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1721,10 +1721,9 @@ void __put_anon_vma(struct anon_vma *ano { struct anon_vma *root = anon_vma->root; + anon_vma_free(anon_vma); if (root != anon_vma && atomic_dec_and_test(&root->refcount)) anon_vma_free(root); - - anon_vma_free(anon_vma); } #ifdef CONFIG_MIGRATION -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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