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authorAndrey Ryabinin <a.ryabinin@samsung.com>2014-06-06 19:09:30 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-06 19:53:41 +0400
commit624483f3ea82598ab0f62f1bdb9177f531ab1892 (patch)
treedb14accead23e539ddbb9ff5eb9994179c69e6b8 /mm/sparse.c
parent951e273060d15b233a7f7ccaf76ba682b5b05a03 (diff)
downloadlinux-624483f3ea82598ab0f62f1bdb9177f531ab1892.tar.xz
mm: rmap: fix use-after-free in __put_anon_vma
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@samsung.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> # v3.0+ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
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