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Eduardo Lima Mitev authored
_mesa_lookup_texture_err() is not currently checking that the texture-id can be zero, but _mesa_HashLookup() doesn't expect the key to be zero, and will fail an assertion. Considering that _mesa_lookup_texture_err() is called from _mesa_GetTextureImage and _mesa_GetTextureSubImage with user provided arguments, we must validate the texture-id before looking it up in the hash-table. Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
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