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Patch for Bug#12374486 - SEVERE MEMORY LEAK IN PREPARED STATEMENTS

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THAT CALL STORED PROCEDURES.

The bug was introduced by WL#4435. The problem was that if a stored
procedure generated a few result sets with different set of columns,
a new memory would be allocated after every EXECUTE for every
result set.

The fix is to introduce a new memory root in scope of MYSQL_STMT,
and to store result-set metadata in that memory root.
This commit is contained in:
Alexander Nozdrin
2011-05-06 17:39:20 +04:00
parent acbe82380e
commit 32a41e5a25
3 changed files with 59 additions and 23 deletions
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3
include/mysql.h.pp
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@@ -512,6 +512,7 @@ typedef struct st_mysql_bind
my_bool is_null_value;
void *extension;
} MYSQL_BIND;
struct st_mysql_stmt_extension;
typedef struct st_mysql_stmt
{
MEM_ROOT mem_root;
@@ -541,7 +542,7 @@ typedef struct st_mysql_stmt
unsigned char bind_result_done;
my_bool unbuffered_fetch_cancelled;
my_bool update_max_length;
void *extension;
struct st_mysql_stmt_extension *extension;
} MYSQL_STMT;
enum enum_stmt_attr_type
{