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shader/tgsi: check array access and report failure when needed

Gert Wollny requested to merge gerddie/virglrenderer:fix-tgsi-parse-vunerability into master

Originally in mesa TGSI was never intended to be interfaced from outside the library so that one could rely on the code to adhere the limits for inputs, outputs etc. However, with virglrenderer we receive TGSI as text and the text parser doesn't check the limits, so that the actual TGSI might be illegal and result in OOB access.

Since checking these limits when parsing the text would be more tedious, check these limits in the tgsi info parser that is always run before when the TGSI is translated and report errors.

Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/339

Signed-off-by: Gert Wollny gert.wollny@collabora.co.uk

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