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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_prepare.cc
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@ -3848,7 +3848,7 @@ Prepared_statement::~Prepared_statement()
free_items();
if (lex)
{
delete lex->sphead;
sp_head::destroy(lex->sphead);
delete lex->result;
delete (st_lex_local *) lex;
}