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fixes for several potential null pointer dereferences

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submitted by: Paul "Shag" Walmsley <ccshag@cclabs.missouri.edu>
This commit is contained in:
Marc G. Fournier
1996-07-12 04:53:59 +00:00
parent 950b6ab022
commit e72ca17f77
2 changed files with 140 additions and 15 deletions
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97
src/interfaces/libpq/fe-exec.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.1.1.1 1996/07/09 06:22:17 scrappy Exp $
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.2 1996/07/12 04:53:59 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -358,12 +358,20 @@ PQexec(PGconn* conn, char* query)
char cmdStatus[MAX_MESSAGE_LEN];
char pname[MAX_MESSAGE_LEN]; /* portal name */
PGnotify *newNotify;
FILE *Pfin = conn->Pfin;
FILE *Pfout = conn->Pfout;
FILE* Pfdebug = conn->Pfdebug;
FILE *Pfin, *Pfout, *Pfdebug;
pname[0]='\0';
if (!conn) return NULL;
if (!query) {
sprintf(conn->errorMessage, "PQexec() -- query pointer is null.");
return NULL;
}
Pfin = conn->Pfin;
Pfout = conn->Pfout;
Pfdebug = conn->Pfdebug;
/*clear the error string */
conn->errorMessage[0] = '\0';
@ -500,6 +508,9 @@ PGnotify*
PQnotifies(PGconn *conn)
{
Dlelem *e;
if (!conn) return NULL;
if (conn->status != CONNECTION_OK)
return NULL;
/* RemHead returns NULL if list is empy */
@ -531,6 +542,8 @@ int
PQgetline(PGconn *conn, char *s, int maxlen)
{
int c = '\0';
if (!conn) return EOF;
if (!conn->Pfin || !s || maxlen <= 1)
return(EOF);
@ -561,7 +574,7 @@ PQgetline(PGconn *conn, char *s, int maxlen)
void
PQputline(PGconn *conn, char *s)
{
if (conn->Pfout) {
if (conn && (conn->Pfout)) {
(void) fputs(s, conn->Pfout);
fflush(conn->Pfout);
}
@ -580,8 +593,12 @@ int
PQendcopy(PGconn *conn)
{
char id;
FILE *Pfin = conn->Pfin;
FILE* Pfdebug = conn->Pfdebug;
FILE *Pfin, *Pfdebug;
if (!conn) return (int)NULL;
Pfin = conn->Pfin;
Pfdebug = conn->Pfdebug;
if ( (id = pqGetc(Pfin,Pfdebug)) > 0)
return(0);
@ -836,12 +853,16 @@ PQfn(PGconn *conn,
PQArgBlock *args,
int nargs)
{
FILE *Pfin = conn->Pfin;
FILE *Pfout = conn->Pfout;
FILE* Pfdebug = conn->Pfdebug;
FILE *Pfin, *Pfout, *Pfdebug;
int id;
int i;
if (!conn) return NULL;
Pfin = conn->Pfin;
Pfout = conn->Pfout;
Pfdebug = conn->Pfdebug;
/* clear the error string */
conn->errorMessage[0] = '\0';
@ -916,18 +937,33 @@ PQfn(PGconn *conn,
ExecStatusType
PQresultStatus(PGresult* res)
{
if (!res) {
fprintf(stderr, "PQresultStatus() -- pointer to PQresult is null");
return PGRES_NONFATAL_ERROR;
}
return res->resultStatus;
}
int
PQntuples(PGresult *res)
{
if (!res) {
fprintf(stderr, "PQntuples() -- pointer to PQresult is null");
return (int)NULL;
}
return res->ntups;
}
int
PQnfields(PGresult *res)
{
if (!res) {
fprintf(stderr, "PQnfields() -- pointer to PQresult is null");
return (int)NULL;
}
return res->numAttributes;
}
@ -937,6 +973,12 @@ PQnfields(PGresult *res)
char*
PQfname(PGresult *res, int field_num)
{
if (!res) {
fprintf(stderr, "PQfname() -- pointer to PQresult is null");
return NULL;
}
if (field_num > (res->numAttributes - 1)) {
fprintf(stderr,
"PQfname: ERROR! name of field %d(of %d) is not available",
@ -957,6 +999,11 @@ PQfnumber(PGresult *res, char* field_name)
{
int i;
if (!res) {
fprintf(stderr, "PQfnumber() -- pointer to PQresult is null");
return -1;
}
if (field_name == NULL ||
field_name[0] == '\0' ||
res->attDescs == NULL)
@ -973,6 +1020,11 @@ PQfnumber(PGresult *res, char* field_name)
Oid
PQftype(PGresult *res, int field_num)
{
if (!res) {
fprintf(stderr, "PQftype() -- pointer to PQresult is null");
return InvalidOid;
}
if (field_num > (res->numAttributes - 1)) {
fprintf(stderr,
"PQftype: ERROR! type of field %d(of %d) is not available",
@ -987,6 +1039,11 @@ PQftype(PGresult *res, int field_num)
int2
PQfsize(PGresult *res, int field_num)
{
if (!res) {
fprintf(stderr, "PQfsize() -- pointer to PQresult is null");
return (int2)NULL;
}
if (field_num > (res->numAttributes - 1)) {
fprintf(stderr,
"PQfsize: ERROR! size of field %d(of %d) is not available",
@ -999,6 +1056,11 @@ PQfsize(PGresult *res, int field_num)
}
char* PQcmdStatus(PGresult *res) {
if (!res) {
fprintf(stderr, "PQcmdStatus() -- pointer to PQresult is null");
return NULL;
}
return res->cmdStatus;
}
@ -1008,6 +1070,11 @@ char* PQcmdStatus(PGresult *res) {
if not, return ""
*/
char* PQoidStatus(PGresult *res) {
if (!res) {
fprintf(stderr, "PQoidStatus() -- pointer to PQresult is null");
return NULL;
}
if (!res->cmdStatus)
return "";
@ -1031,6 +1098,11 @@ char* PQoidStatus(PGresult *res) {
char*
PQgetvalue(PGresult *res, int tup_num, int field_num)
{
if (!res) {
fprintf(stderr, "PQgetvalue() -- pointer to PQresult is null");
return NULL;
}
if (tup_num > (res->ntups - 1) ||
field_num > (res->numAttributes - 1)) {
fprintf(stderr,
@ -1050,6 +1122,11 @@ PQgetvalue(PGresult *res, int tup_num, int field_num)
int
PQgetlength(PGresult *res, int tup_num, int field_num)
{
if (!res) {
fprintf(stderr, "PQgetlength() -- pointer to PQresult is null");
return (int)NULL;
}
if (tup_num > (res->ntups - 1 )||
field_num > (res->numAttributes - 1)) {
fprintf(stderr,