Tested on x86_64. build-many-glibcs run in progress.
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* malloc/malloc.c (_int_free): Check for corrupt prev_size vs size.
(malloc_consolidate): Likewise.

(cherry picked from commit d6db68e66dff25d12c3bc5641b60cbd7fb6ab44f)
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 ChangeLog       | 5 +++++
 malloc/malloc.c | 4 ++++
 2 files changed, 9 insertions(+)

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Cheers,
Carlos.