From 970a6d536c7159f8002930d8513dfc24beeca87e Mon Sep 17 00:00:00 2001
From: David Lin <linpeng1577@gmail.com>
Date: Mon, 10 Aug 2020 17:59:53 +0800
Subject: [PATCH] Fixed stack overflow bug in bc26.c

    if (!str)
    {
        return -1;
    }
---
 devices/bc26/bc26.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/devices/bc26/bc26.c b/devices/bc26/bc26.c
index 6540077e..62af3f13 100644
--- a/devices/bc26/bc26.c
+++ b/devices/bc26/bc26.c
@@ -118,6 +118,10 @@ static int bc26_signal_quality_check(void)
     }
 
     str = strstr(echo.buffer, "+CSQ:");
+    if (!str) 
+    {
+        return -1;
+    }
     sscanf(str, "+CSQ:%d,%d", &rssi, &ber);
     if (rssi == 99) {
         return -1;
@@ -156,6 +160,10 @@ static int bc26_band_check(void)
     }
 
     str = strstr(echo.buffer, "+QBAND:");
+    if (!str) 
+    {
+        return -1;
+    }
     sscanf(str, "+QBAND:%d", &band);
     if (band != 8) {
         return -1;
@@ -236,6 +244,10 @@ static int bc26_connect(const char *ip, const char *port, sal_proto_t proto)
         return -1;
     }
     str = strstr(echo.buffer, "+QSOC=");
+    if (!str) 
+    {
+        return -1;
+    }
     sscanf(str, "+QSOC=%d", &id);
 
     printf("get socket id is %d\r\n",id);
-- 
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