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MDEV-21341: Fix UBSAN failures: Issue Six

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(Variant #2 of the patch, which keeps the sp_head object inside the
MEM_ROOT that sp_head object owns)
(10.3 version of the fix, with handling for class sp_package)

sp_head::operator new() and operator delete() were dereferencing sp_head*
pointers to memory that didn't hold a valid sp_head object (it was
not created/already destroyed).
This caused UBSan to crash when looking up type information.

Fixed by providing static sp_head::create() and sp_head::destroy() methods.
This commit is contained in:
Sergei Petrunia
2020-01-12 22:15:55 +03:00
parent 9c3eca8514
commit d531b4ee3a
9 changed files with 71 additions and 55 deletions
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2
sql/sql_parse.cc
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@ -5083,7 +5083,7 @@ mysql_execute_command(THD *thd)
/* Don't do it, if we are inside a SP */
if (!thd->spcont)
{
delete lex->sphead;
sp_head::destroy(lex->sphead);
lex->sphead= NULL;
}
/* lex->unit.cleanup() is called outside, no need to call it here */