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  1. MariaDB Connector/C
  2. CONC-83

Crash by a NULL dereferencing of stmt->mysql in mysql_stmt_prepare after computer wake up from suspended state

Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • None
    • None
    • None
    • None
    • Win64 build with mingw64 4.8.0
      Library r118, MariaDB 5.5.33a and Qt4.8.5

    Description

      Hi,

      We have sometimes crash of the library inside call of mysql_stmt_prepare.

      The stmt->mysql is NULL and dereferenced.

      The last error states a lost connection, which can be normal. The crash happened just after a wake up of a suspended state of the computer.

      I have included a screenshot, with the state of all variables when app was crashing, if it can help.

      We are using vanilla r118 of the library.

      Thanks,
      Best Regards,
      Eric

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. CONC-97 Crash by a NULL dereferencing of stmt->mysql in mysql_stmt_reset

          • Major - Major loss of function.
          • Closed

          Activity

            Ascending order - Click to sort in descending order
            georg Georg Richter added a comment -

            Crash happens, if reconnect option is enabled.

            static int test_conc83(MYSQL *mysql)
            		 
            {
            		 
              MYSQL_STMT *stmt;
            		 
              int rc;
            		 
             
            		 
              char *query= "SELECT 1,2,3 FROM DUAL";
            		 
             
            		 
              stmt= mysql_stmt_init(mysql);
            		 
             
            		 
              mysql->reconnect= 1;
            		 
             
            		 
              rc= mysql_kill(mysql, mysql_thread_id(mysql));
            		 
             
            		 
              rc= mysql_stmt_prepare(stmt, query, strlen(query));
            		 
              FAIL_IF(!rc, "Error expected");
            		 
             
            		 
              mysql_stmt_close(stmt);
            		 
              return OK;
            		 
            }

            georg Georg Richter added a comment - Crash happens, if reconnect option is enabled. static int test_conc83(MYSQL *mysql) { MYSQL_STMT *stmt; int rc;   char *query= "SELECT 1,2,3 FROM DUAL";   stmt= mysql_stmt_init(mysql);   mysql->reconnect= 1;   rc= mysql_kill(mysql, mysql_thread_id(mysql));   rc= mysql_stmt_prepare(stmt, query, strlen(query)); FAIL_IF(!rc, "Error expected");   mysql_stmt_close(stmt); return OK; }
            etrinh Eric Trinh added a comment -

            Yes, I confirm, we have reconnect option enabled.

            etrinh Eric Trinh added a comment - Yes, I confirm, we have reconnect option enabled.
            georg Georg Richter added a comment -

            Fixed in rev.122

            georg Georg Richter added a comment - Fixed in rev.122

            People

              georg Georg Richter
              etrinh Eric Trinh
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              Dates

                Created:
                Updated:
                Resolved:

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