Fix segfault in dbtpn when value parameter is nullptr

Running 'dbtpn Record' in iocsh would result in a segfault.
2021-07-21 17:26:39 -07:00
parent ff1b9d4250
commit 05bf567f3b
1 changed files with 4 additions and 2 deletions
@@ -613,8 +613,10 @@ long dbtpn(char *pname, char *pvalue)
    ptpnInfo = dbCalloc(1, sizeof(tpnInfo));
    ptpnInfo->ppn = ppn;
    ptpnInfo->callbackDone = epicsEventCreate(epicsEventEmpty);
-    strncpy(ptpnInfo->buffer, pvalue, 80);
-    ptpnInfo->buffer[79] = 0;
+    if (pvalue) {
+        strncpy(ptpnInfo->buffer, pvalue, sizeof(ptpnInfo->buffer));
+        ptpnInfo->buffer[sizeof(ptpnInfo->buffer)-1] = 0;
+    }

    ppn->usrPvt = ptpnInfo;
    epicsThreadCreate("dbtpn", epicsThreadPriorityHigh,