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Alexander Moch
e7f9734bc7
The Zstd context mempool can reuse buffers that were previously poisoned under AddressSanitizer, leading to false-positive use-after-poison reports during zloop and other stress tests. Explicitly unpoison memory when handing buffers out to Zstd and poison the user-visible region again when buffers are returned to the pool. This makes the allocator ASan-correct while preserving existing pooling behavior. Also fix non-standard void * pointer arithmetic in zstd_free() and remove an early return in zstd_dctx_alloc() so kmem_type/kmem_size are always set on pool hits. This only affects ASan bookkeeping in user space, does not change runtime behavior in non-ASan configurations, and does not affect on-disk formats. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Moch <mail@alexmoch.com> Closes #18089