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I think I would dispute that fedora is affected by this, referencing my comment in the upstream bug,
The code has diverged a bit in git so the proposed debian patch no longer applies.
But good news: the current code should be safe(r), since all uses of
are initialized to avoid the problem, in particular, the code closest to what this patch touches now contains:
# look for both vendor-app.desktop, vendor/app.desktop
Lastly, with test case given in debian report, I cannot reproduce, at least not with the versions of bash and dash shipped with fedora 20:
$ cat testme
$ bash testme
$ dash testme
$ rpm -q bash dash
Apologies, this bug was filed prior to the proper analysis. Fedora is not affected by this flaw.
Thanks for looking into this!