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MDEV-22005 UBSAN: applying non-zero offset 2 to null pointer in my_charpos_mb()

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Empty comment has a correct length.
This commit is contained in:
Eugene Kosov
2020-03-23 02:08:01 +03:00
parent 5918b17004
commit 0b00c1a22f
2 changed files with 12 additions and 4 deletions
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10
sql/sql_table.cc
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@ -1,6 +1,6 @@
/*
Copyright (c) 2000, 2019, Oracle and/or its affiliates.
Copyright (c) 2010, 2019, MariaDB
Copyright (c) 2010, 2020, MariaDB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@ -4286,8 +4286,12 @@ bool validate_comment_length(THD *thd, LEX_STRING *comment, size_t max_len,
uint err_code, const char *name)
{
DBUG_ENTER("validate_comment_length");
uint tmp_len= my_charpos(system_charset_info, comment->str,
comment->str + comment->length, max_len);
if (comment->length == 0)
DBUG_RETURN(false);
size_t tmp_len=
Well_formed_prefix(system_charset_info, *comment, max_len).length();
if (tmp_len < comment->length)
{
if (thd->is_strict_mode())