https://bugs.freedesktop.org/show_bug.cgi?id=57372
Priority: medium
Bug ID: 57372
Assignee: mesa-dev@lists.freedesktop.org
Summary: x11-libs/libxcb media-libs/mesa segfault in
__glXGetString
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: ri...@gentoo.org
Hardware: x86-64 (AMD64)
Status: NEW
Version: 9.0
Component: GLX
Product: Mesa
Created attachment 70371
--> https://bugs.freedesktop.org/attachment.cgi?id=70371&action=edit
backtrace
Downstream bug:
https://bugs.gentoo.org/show_bug.cgi?id=444159
I'm getting a segfault in libxcb, which seems to be the result of calling
xcb_glx_get_string_string_length with a null parameter in __glXGetString. The
call into mesa originates in qt-opengl, called from the application sleepyhead.
Full backtrace attached - happy to generate additional info as required.
I couldn't find documentation concerning error handling in these functions, so
I'm not sure what point in the call chain is considered at-fault for passing
along bad input. I did note that __glXGetString does not check the value of
reply before passing it along, which might or might not be intended.
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