[英]SIGABRT when returning from function
我的问题是,正如我在标题中提到的那样,我有一个函数,该函数在返回时会引发SIGABRT。 我在我的程序上运行了valgrind,并且在那个确切的时间点就明白了。
==5807== Process terminating with default action of signal 6 (SIGABRT)
==5807== at 0x52F5428: raise (raise.c:54)
==5807== by 0x52F7029: abort (abort.c:89)
==5807== by 0x53377E9: __libc_message (libc_fatal.c:175)
==5807== by 0x53D911B: __fortify_fail (fortify_fail.c:37)
==5807== by 0x53D90BF: __stack_chk_fail (stack_chk_fail.c:28)
==5807== by 0x402E8B: foo (file.c:43)
==5807== by 0x202C27323939312C: ???
==5807== by 0x592D4D4D2D444426: ???
==5807== by 0x66202C2927595958: ???
==5807== by 0x2965736C60: ???
==5807== by 0x505770F: ??? (in /usr/lib/x86_64-linux-gnu/libodbc.so.2.0.0)
==5807==
这是我正在执行的代码,堆栈错误导致add_user的return ret语句中止:
int add_user(SQLHDBC dbc, char * mail, char * password, char * name, char * date) {
char query[TAM];
SQLHSTMT stmt;
SQLRETURN ret;
if (mail == NULL || password == NULL || name == NULL || date == NULL)
return ERR;
sprintf(query, "INSERT INTO mms_user values (default,'%s',encrypt_password('%s'),set_type(),'%s',to_date('%s', 'DD-MM-YYYY'), false)", mail, password, name,date);
ret= DBExecuteQuery(dbc, query, &stmt);
DBFreeHandle(&stmt);
return ret;
}
int DBExecuteQuery(SQLHDBC dbc, char * query, SQLHSTMT *stmt) {
SQLRETURN ret;
/*Error control*/
if (query == NULL || stmt == NULL)
return ERR;
/*Allocates memory for a new statement*/
ret = SQLAllocHandle(SQL_HANDLE_STMT, dbc, stmt);
if (!SQL_SUCCEEDED(ret)) {
return ERR;
}
/*Executes query and stores result in stmt*/
ret = SQLExecDirect(*stmt, (SQLCHAR *)query, SQL_NTS);
if (!SQL_SUCCEEDED(ret))
return ERR;
return OK;
}
int DBFreeHandle(SQLHSTMT * stmt){
int ret;
/*Frees allocated memory*/
ret = SQLFreeHandle(SQL_HANDLE_STMT, *stmt);
if (!SQL_SUCCEEDED(ret)) {
return ERR;
}
}
据我检查,该功能正常执行。 我不知道会发生什么,如果任何人都可以提供任何可能的解释,我将非常感激。 也可以随时询问更多信息(这是我被教导要寻找的唯一有用的信息,因此在这种情况下,我可能需要一些指导)。
先感谢您
此代码很危险:
char query[TAM];
.
.
.
sprintf(query, "INSERT INTO mms_user values"
" (default,'%s',encrypt_password('%s'),set_type(),"
"'%s',to_date('%s', 'DD-MM-YYYY'), false)",
mail, password, name,date);
您绝对没有边界检查,因此它很容易溢出堆栈。
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