deep recursion in Encode::find_encoding when decoding bad MIME header #127
Description
As reported by Jakub Wilk in https://bugs.debian.org/880085
perl -MEncode -e 'Encode::decode("MIME-Header", "=?U".("_"x200)."?Q??=")'
gives the deep recursion warnings below on Perl 5.26.1, Encode 2.93 (and also 2.88 as bundled with 5.26.1.)
Deep recursion on subroutine "Encode::find_encoding" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode/Alias.pm line 44.
Deep recursion on subroutine "Encode::getEncoding" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 152.
Deep recursion on subroutine "Encode::Alias::find_alias" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 144.
Deep recursion on subroutine "Encode::Alias::find_alias" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 144.
Deep recursion on subroutine "Encode::find_encoding" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode/Alias.pm line 44.
Deep recursion on subroutine "Encode::getEncoding" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 152.
Deep recursion on subroutine "Encode::Alias::find_alias" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 144.
Deep recursion on subroutine "Encode::find_encoding" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode/Alias.pm line 44.
Deep recursion on subroutine "Encode::getEncoding" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 152.
Deep recursion on subroutine "Encode::Alias::find_alias" at /usr/lib/x86_64-linux-gnu/perl5/5.26/Encode.pm line 144.