Alexander Barkov d646e24f7f MDEV-40009 SIGSEGV in Sql_path::from_text ...

Problem:
- The string passed to Sql_path::from_text() could be in
  various character sets, returned by Item::val_str_ascii(),
  which is not necessarily utf8mb3.
- While the code in Sql_path::from_text() was written in the way
  that "str" was considered to be in utf8mb3.
- As as result, cs->charset() in this line:
    auto len = cs->charlen(curr, end);
  could return a negative value and the whole loop got stuck.

Changes:
- Fixing Sys_var_path::from_item() to use val_str() instead of val_str_ascii(),
  to get the original value from "item", without any conversion.
- Moving the conversion code inside Sql_path::from_text().

2026-08-12 13:25:01 +04:00

12 KiB

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