Bug 40308

Summary:	glGenerateMipmap causes segmentation fault
Product:	Mesa	Reporter:	tero.pihlajakoski
Component:	Drivers/DRI/i915	Assignee:	Eric Anholt <eric>
Status:	RESOLVED FIXED	QA Contact:
Severity:	critical
Priority:	medium
Version:	7.10
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Source code to reproduce bug

Description tero.pihlajakoski 2011-08-23 05:49:06 UTC

Created attachment 50487 [details]
Source code to reproduce bug

If glGenerateMipmap is called on i915 driver, a segmentation fault is signaled.

Attached is a test file derived from opengles2 demo `tri.c'. It can be run with `gcc -lGLESv2 -lEGL -lm ./crash.h && ./a.out' provided the i915 EGL and GLES 2 drivers have been installed.

The important line is #499. Removing it will prevent the segmentation fault from happening. There are no textures generated, but calling the function in question should not cause a segmentation fault.

Note that the defect occurs on Mesa 7.11 also.

Comment 1 Eric Anholt 2011-10-04 13:05:00 UTC

Oh, if glGenerateMipmap() is called on a texture object with no teximage to generate from at all.  Funny.  I'll make a piglit test for it.

Comment 2 Eric Anholt 2011-10-20 10:58:21 UTC

I accidentally squashed the fix into this unrelated commit:

commit f80e1e7d1de80fd919f376368d1cfc9416dabdc3
Author: Eric Anholt <eric@anholt.net>
Date:   Tue Oct 18 11:52:39 2011 -0700

    mesa: Round the argument to PixelStoref instead of truncating.

Thanks for the bug report with testcase!

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