A potential bug of free of stack address

[ash1852]

hello, I found a potential bug of free of stack address in source code of mysql, the overview of occurrence is shown as follows.


step1:
in mysql/sql-common/client.c line 3585
defined a local variable tmp_mysql in this line

step2:
in mysql/sql-common/client.c line 3615
in a path derived from step1,there is a call of mysql_close and stack address of tmp_mysql is used as 1st parameter

step3:
in mysql/sql-common/client.c line 3823
the parameter of function mysql_close is used as 1st parameter of function my_free

step4:
in mysql/mysys/my_malloc.c line 134
free of stack address here

[ash1852]

would you help check if this bug is true?thank you very much.