Merge pull request #18230 from taosdata/fix/TD-19618-D

fix: real path optimization in case of invalid read

source/dnode/vnode/src/tsdb/tsdbOpen.c

@@ -49,7 +49,7 @@ int tsdbOpen(SVnode *pVnode, STsdb **ppTsdb, const char *dir, STsdbKeepCfg *pKee
 
   pTsdb->path = (char *)&pTsdb[1];
   snprintf(pTsdb->path, TD_PATH_MAX, "%s%s%s", pVnode->path, TD_DIRSEP, dir);
-  taosRealPath(pTsdb->path, NULL, slen);
+  // taosRealPath(pTsdb->path, NULL, slen);
   pTsdb->pVnode = pVnode;
   taosThreadRwlockInit(&pTsdb->rwLock, NULL);
   if (!pKeepCfg) {

source/os/src/osDir.c

@@ -336,12 +336,14 @@ int32_t taosRealPath(char *dirname, char *realPath, int32_t maxlen) {
 #else
   if (realpath(dirname, tmp) != NULL) {
 #endif
-    if (realPath == NULL) {
-      strncpy(dirname, tmp, maxlen);
-    } else {
-      strncpy(realPath, tmp, maxlen);
+    if (strlen(tmp) < maxlen) {
+      if (realPath == NULL) {
+        strncpy(dirname, tmp, maxlen);
+      } else {
+        strncpy(realPath, tmp, maxlen);
+      }
+      return 0;
     }
-    return 0;
   }
 
   return -1;