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shell: avoid segfault on ${0::0/0~09J}. Closes 15216
CVE: CVE-2022-48174
Upstream-Status: Backport [https://git.launchpad.net/ubuntu/+source/busybox/commit/?id=ca2afcbf42017d998ce3d6726f5ff5072a3fa853]
(From OE-Core rev: a81aff7d810800ce3265422cddde26d11366d514)
Signed-off-by: Victor Giraud <vgiraud.opensource@witekio.com>
Signed-off-by: Bruno Vernay <bruno.vernay@se.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>