Fix GH-19397: mb_list_encodings() can cause crashes on shutdown #19405
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The request shutdown does not necessarily hold the last reference, if there is still a CV that refers to the array.
youkidearitai
approved these changes
Aug 7, 2025
nikic
reviewed
Aug 7, 2025
ext/mbstring/mbstring.c
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| if (GC_DELREF(MBSTRG(all_encodings_list)) == 0) { | ||
| /* must be *array* destroy to remove from GC root buffer and free the hashtable itself */ | ||
| zend_array_destroy(MBSTRG(all_encodings_list)); | ||
| } |
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Wanted to avoid the immutability check, but sure
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In fact that's what I proposed initially #19397 (comment)
youkidearitai
approved these changes
Aug 8, 2025
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The request shutdown does not necessarily hold the last reference, if there is still a CV that refers to the array.