Confirmed on a second machine running a newer release, with a stock
package.
Distro: Ubuntu 26.04.1 LTS
unity: 7.7.1+26.04.20260306-0ubuntu3 (unmodified)
Same workload - a Wine application, menus opened and closed rapidly - and the
same
crash. So this is neither specific to 24.04 nor to the machine I reported from,
and
it is not an artefact of the modified library on that machine.
A correction to my original report while I am here: I wrote that the code was
"unchanged since 2023-02-22". That date is only the snapshot date of the 24.04
source tarball. The file itself, decorations/DecoratedWindow.cpp, has not been
touched upstream since 2021-10-26, and ComputeShapedShadowQuad() in current
upstream master still reads:
if (width != last_shadow_rect_.width() || height !=
last_shadow_rect_.height())
shaped_shadow_pixmap_ = BuildShapedShadowTexture({width, height}, radius,
color, shape);
const auto* texture = shaped_shadow_pixmap_->texture();
which is the missing NULL check described in the report. The newer 7.7.1
snapshot in
26.04 therefore carries it as well, which is consistent with the crash
reproducing
there.
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https://bugs.launchpad.net/bugs/2165662
Title:
compiz crashes in ComputeShapedShadowQuad: null shaped_shadow_pixmap_
dereferenced
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