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Commit 65375ce7 authored by Andrey Ryabinin's avatar Andrey Ryabinin Committed by Greg Kroah-Hartman
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mm: rmap: fix use-after-free in __put_anon_vma


commit 624483f3 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: default avatarAndrey Ryabinin <a.ryabinin@samsung.com>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4cca9669
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