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Build # 11344447181

Build Type

push

github

Committed by Buristan

Commit Message

FFI: Fix __tostring metamethod access to enum cdata value.

Thanks to Sergey Kaplun.

(cherry picked from commit f2a1cd432)

On a 64-bit host, `*(uint32_t **)p` (in the
`lj_cf_ffi_meta___tostring()`) is the read of 8 bytes, while the size of
the cdata tail for the enum is only 4. This leads to heap-buffer-overflow
during the call of `tostring()` on the corresponding cdata.

This patch fixes the pointer cast to `(uint32_t *)p`, which is correct.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#10199

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