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Staring from glibc 2.17 the crypt() function will error out and return NULL if the seed or "correct" is invalid. The failure case for this is the sudo user having a locked account in /etc/shadow, so their password is "!", which is an invalid hash. crypt() never returned NULL previously so this is crashing in strcmp(). [ YOCTO #4241 ] (From OE-Core rev: 06d7078f7631b92e8b789f8e94a3a346d8181ce6) Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>