From 7dae76b10bac4c008b6f8bb13d7f650ba8386492 Mon Sep 17 00:00:00 2001
From: yangfeng <yangfeng@espressif.com>
Date: Fri, 22 Aug 2025 12:08:48 +0800
Subject: [PATCH] fix(esp_coex): Fix the issue of uninitialized pointer reading
 in coexist_printf

---
 components/esp_coex/src/lib_printf.c | 52 ++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 components/esp_coex/src/lib_printf.c

diff --git a/components/esp_coex/src/lib_printf.c b/components/esp_coex/src/lib_printf.c
new file mode 100644
index 0000000000..a8429225b4
--- /dev/null
+++ b/components/esp_coex/src/lib_printf.c
@@ -0,0 +1,52 @@
+/*
+ * SPDX-FileCopyrightText: 2016-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file lib_printf.c
+ *
+ * This file contains library-specific printf functions
+ * used by WiFi libraries in the `lib` directory.
+ * These function are used to catch any output which gets printed
+ * by libraries, and redirect it to ESP_LOG macros.
+ *
+ * Eventually WiFi libraries will use ESP_LOG functions internally
+ * and these definitions will be removed.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "esp_log.h"
+#include "esp_attr.h"
+
+#define VPRINTF_STACK_BUFFER_SIZE 80
+
+static int lib_printf(const char* tag, const char* format, va_list arg)
+{
+    char temp[VPRINTF_STACK_BUFFER_SIZE];
+    int len = vsnprintf(temp, sizeof(temp) - 1, format, arg);
+    temp[sizeof(temp) - 1] = 0;
+    int i;
+    for (i = len - 1; i >= 0; --i) {
+        if (temp[i] != '\n' && temp[i] != '\r' && temp[i] != ' ') {
+            break;
+        }
+        temp[i] = 0;
+    }
+    if (i > 0) {
+        ESP_LOGI(tag, "%s", temp);
+    }
+    va_end(arg);
+    return len;
+}
+
+int coexist_printf(const char* format, ...)
+{
+    va_list arg = {};
+    va_start(arg, format);
+    int res = lib_printf("coexist", format, arg);
+    va_end(arg);
+    return res;
+}