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author | Father Chrysostomos <sprout@cpan.org> | 2015-02-04 21:30:36 -0800 |
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committer | Father Chrysostomos <sprout@cpan.org> | 2015-02-05 09:15:16 -0800 |
commit | eabab8bccf871f8e85dfa4a3825827825fb86cd9 (patch) | |
tree | da9bcf2f2c1e523325d84a08b05924f44f0825ad /t/base | |
parent | 67c71cbbd62a75ff2b913421806f6ea0f0b33558 (diff) | |
download | perl-eabab8bccf871f8e85dfa4a3825827825fb86cd9.tar.gz |
Localise PL_lex_stuff (crash fix)
This fixes crashes and assertion failures related to ticket #123617.
When the lexer encounters a quote-like operator, it scans for the
final delimiter, putting the string in PL_lex_stuff and the replace-
ment, if any, in PL_sublex_info.repl. Those are just temporary spots
for those values. As soon as the next token is emitted (FUNC or
PMFUNC), the values are copied to PL_linestr and PL_lex_repl, respec-
tively, after these latter have been localised.
When scan_str (which scans a quote-like op) sees that PL_lex_stuff is
already set, it assumes that it is now parsing a replacement, so it
puts the result in PL_sublex_info.repl.
The FUNC or PMFUNC token for a quote-like operator may trigger a syn-
tax error while PL_lex_stuff and PL_sublex_info.repl are still set. A
syntax error can cause scopes to be popped, discarding the inner lex-
ing scope (for the quote op) that we were about to enter, but leaving
a PL_lex_stuff value behind.
If another quote-like op is parsed after that, scan_str will assume it
is parsing a replacement since PL_lex_stuff is set. So you can end up
with a replacement for an op of type OP_MATCH, which is not supposed
to happen. S_sublex_done fails an assertion in that case. Some exam-
ples of this bug crash later on non-debugging builds.
Localising PL_lex_stuff fixes the problem.
Diffstat (limited to 't/base')
-rw-r--r-- | t/base/lex.t | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/t/base/lex.t b/t/base/lex.t index f93816855c..66db28b0ae 100644 --- a/t/base/lex.t +++ b/t/base/lex.t @@ -485,3 +485,6 @@ print "ok $test - map{sub :lvalue...}\n"; $test++; # Used to crash [perl #123711] 0-5x-l{0}; + +# Used to fail an assertion [perl #123617] +eval '"$a{ 1 m// }"; //'; |