diff --git a/MDK-ARM/LWIP.uvguix.29643 b/MDK-ARM/LWIP.uvguix.29643
index 469e257..069200e 100644
--- a/MDK-ARM/LWIP.uvguix.29643
+++ b/MDK-ARM/LWIP.uvguix.29643
@@ -3705,9 +3705,9 @@
       </Doc>
       <Doc>
         <Name>..\usersrc\atcmd.c</Name>
-        <ColumnNumber>47</ColumnNumber>
+        <ColumnNumber>0</ColumnNumber>
         <TopLine>71</TopLine>
-        <CurrentLine>99</CurrentLine>
+        <CurrentLine>102</CurrentLine>
         <Folding>1</Folding>
         <ContractedFolders></ContractedFolders>
         <PaneID>0</PaneID>
diff --git a/usersrc/atcmd.c b/usersrc/atcmd.c
index b9f6ec5..d0abf08 100644
--- a/usersrc/atcmd.c
+++ b/usersrc/atcmd.c
@@ -65,7 +65,7 @@ AT_STATUS at_cmd_test(unsigned char *p, unsigned char len)
 AT_STATUS at_cmd_ip(unsigned char *p, unsigned char len)
 {
     ip4_addr_t int_addr;
-    char *ip_address;
+    char ip_address[16];
 
     if (*p == '?')
     {
@@ -73,14 +73,18 @@ AT_STATUS at_cmd_ip(unsigned char *p, unsigned char len)
     }
     else
     {
-        ip_address = (char *)malloc(len+1);
+        if (len >= sizeof(ip_address))
+        {
+            printf("AT+ERR\r\n");
+            return AT_ERR;
+        }
         strncpy(ip_address, (const char *)p, len);
+        ip_address[len] = 0;
         printf("ip_address:%s\r\n", ip_address);
         inet_aton(ip_address, &int_addr);
         printf("int_addr:%d\r\n", int_addr.addr);
         // printf("ip address:%s\r\n", p);
         printf("AT+OK\r\n");
-        free(ip_address);
     }
     return AT_SUCCESS;
 }