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FFI: Fix pragma push stack limit check and throw on overflow.
Reported by Sergey Kaplun. (cherry-picked from commit 433d7e8) `cp->packstack` is the array of size `CPARSE_MAX_PACKSTACK` (7). Before the patch, `cp->curpack` is checked to be less than `CPARSE_MAX_PACKSTACK`, but then `cp->packstack` is accessed at `cp->curpack + 1`, which is out of bounds, so `cp->curpack` value is overwritten. This patch fixes a condition and also adds the error throw when counter is overflow (instead of rewriting a top `cp->packstack` value). Sergey Kaplun: * added the description and the test for the problem Resolves tarantool/tarantool#9339 Part of tarantool/tarantool#9145 Reviewed-by: Igor Munkin <imun@tarantool.org> Reviewed-by: Maxim Kokryashkin <m.kokryashkin@tarantool.org> Signed-off-by: Igor Munkin <imun@tarantool.org>
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