diff --git a/shell/full/src/cmds/dmesg.c b/shell/full/src/cmds/dmesg.c
index a03abe81acb7306eadd20872c8597a124fb29098..90ff1fd5670b2e700c553fc64bb2b721cb44c01a 100644
--- a/shell/full/src/cmds/dmesg.c
+++ b/shell/full/src/cmds/dmesg.c
@@ -655,6 +655,12 @@ INT32 OsDmesgWrite2File(const CHAR *fullpath, const CHAR *buf, UINT32 logSize)
 {
     INT32 ret;
 
+    const CHAR *prefix = "/temp/";
+    INT32 prefixLen = strlen(prefix);
+    if (strncmp(fullpath, prefix, prefixLen) != 0) {
+        return -1;
+    }
+
     INT32 fd = open(fullpath, O_CREAT | O_RDWR | O_APPEND, 0644); /* 0644:file right */
     if (fd < 0) {
         return -1;