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i965: Fix crash when calling glViewport with no surface bound

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If EGL_KHR_surfaceless_context is used then glViewport can be called
with NULL for the draw and read surfaces. This was previously causing
a crash because the i965 driver tries to use this point to invalidate
the surfaces and it was derferencing the NULL pointer.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93257
Cc: Nanley Chery <nanley.g.chery@intel.com>
Cc: "11.1" <mesa-stable@lists.freedesktop.org>
Tested-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
(cherry picked from commit 8c5310da9d)
This commit is contained in:
Neil Roberts 2015-12-08 16:35:57 +00:00 • committed by Emil Velikov
parent ab0b96a939
commit bdf289e7fb
1 changed files with 4 additions and 2 deletions
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6
src/mesa/drivers/dri/i965/brw_context.c
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@ -158,8 +158,10 @@ intel_viewport(struct gl_context *ctx)
__DRIcontext *driContext = brw->driContext;
if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
dri2InvalidateDrawable(driContext->driDrawablePriv);
dri2InvalidateDrawable(driContext->driReadablePriv);
if (driContext->driDrawablePriv)
dri2InvalidateDrawable(driContext->driDrawablePriv);
if (driContext->driReadablePriv)
dri2InvalidateDrawable(driContext->driReadablePriv);
}
}