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Fixes the following security vulnerability: CVE-2019-9169: Attempted case-insensitive regular-expression match via proceed_next_node in posix/regexec.c leads to heap-based buffer over-read. Reported by Hongxu Chen. Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>