https://bugs.freedesktop.org/show_bug.cgi?id=102308
Bug ID: 102308
Summary: segfault in glCompressedTextureSubImage3D
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
I was trying to make "high fidelity" work on mesa, but with my limited OpenGL
knowledge maybe the code is wrong.
This is the call in question:
https://github.com/ChristophHaag/hifi/blob/ec6514b13b688a2aa6154359233dcb3f3186cc0e/libraries/gpu-gl/src/gpu/gl45/GL45BackendTexture.cpp#L161-L162
It causes this loop in compressed_tex_sub_image() to fail:
https://cgit.freedesktop.org/mesa/mesa/tree/src/mesa/main/teximage.c#n4955
The incoming texture has width x height 64x64.
Then as I understand it the texImage should be just a part of that texture,
however texImage->Width x texImage->Height is 64x64 too.
with that width and height, image_stride gets calculated to be 4096, which is
problematic, because imageSize was 4096 too.
So the loop ends up subtracting image_stride=4096 from imageSize=4096 six
times. Sometimes this segfaults, sometimes it runs into an assertion.
As I said, maybe the application code is wrong, but I think there is at least
some error checking in mesa missing.
valgrind also reported an invalid read in some maybe relevant code
https://gist.github.com/ChristophHaag/1af7eb4ef207a397460ff2c6719eba2e
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