Varun Gupta 924db8b4ed MDEV-12350: Heap corruption, overrun buffer, ASAN errors, server crash in my_fill_8bit / filesort ...

In the function make_sortkey a tmp buffer was defined and in the absence of
param->tmp_buffer, tmp buffer used the sort_keys buffer. sort_keys buffer
has a length defined in sort_field->length, while param->tmp_buffer is
stored in param->rec_length. Make sure to use the appropriate length
based on which buffer we are using otherwise we'll overflow.

Also added a type cast to size_t during the calculation of the sort keys
buffer size to avoid an oveflow if the buffer size exceeds 32 bits.

2017-12-20 11:50:22 +02:00

55 KiB

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