Fix GH-16630: UAF in lexer with encoding translation and heredocs #16716
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zend_save_lexical_state() can be nested multiple times, for example for the parser initialization and then in the heredoc lexing. The input should not be freed if we restore to the same filtered string.
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This bug was hit again by #16791, where this lexer bug causes heap corruption causing issues later down the line. |
dstogov
approved these changes
Nov 18, 2024
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zend_save_lexical_state() can be nested multiple times, for example for the parser initialization and then in the heredoc lexing. The input should not be freed if we restore to the same filtered string.