From fe6f8d60f60fb2e1254a4240b724121f499a1df0 Mon Sep 17 00:00:00 2001
From: xsren <285808407@qq.com>
Date: Tue, 12 Sep 2023 18:24:50 +0800
Subject: [PATCH] free old pointer as realloc failed.

---
 source/os/src/osFile.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/source/os/src/osFile.c b/source/os/src/osFile.c
index ff0737b9ad..a453a03994 100644
--- a/source/os/src/osFile.c
+++ b/source/os/src/osFile.c
@@ -840,8 +840,13 @@ int64_t taosGetLineFile(TdFilePtr pFile, char **__restrict ptrBuf) {
     }
 
     bufferSize += 512;
-    *ptrBuf = taosMemoryRealloc(*ptrBuf, bufferSize);
-    if (*ptrBuf == NULL) return -1;
+    void* newBuf = taosMemoryRealloc(*ptrBuf, bufferSize);
+    if (newBuf == NULL) {
+      taosMemoryFreeClear(*ptrBuf);
+      return -1;
+    }
+
+    *ptrBuf = newBuf;
   }
 
   (*ptrBuf)[totalBytesRead] = '\0';