video/readers/jpeg: Catch files with unsupported quantization or Huffman tables

video/readers/jpeg: Catch files with unsupported quantization or Huffman tables

Our decoder only supports 2 quantization tables. If a file asks for
a quantization table with index > 1, reject it.

Similarly, our decoder only supports 4 Huffman tables. If a file asks
for a Huffman table with index > 3, reject it.

This fixes some out of bounds reads. It's not clear what degree of control
over subsequent execution could be gained by someone who can carefully
set up the contents of memory before loading an invalid JPEG file.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>