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fix: fixes websocket server possible null dereference

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This commit is contained in:
Ashish Sharma
2026-03-19 14:59:39 +08:00
parent 495904b15f
commit 00a2f7fbbb
1 changed files with 7 additions and 4 deletions
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components/esp_http_server/src/httpd_ws.c
+7 -4
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2020-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2020-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -82,12 +82,15 @@ static bool httpd_ws_get_response_subprotocol(const char *supported_subprotocol,
/* Get first subprotocol from comma separated list */
char *rest = NULL;
char *s = strtok_r(subprotocol, ", ", &rest);
do {
if (strncmp(s, supported_subprotocol, sizeof(subprotocol)) == 0) {
int supported_subprotocol_len = strlen(supported_subprotocol);
while (s != NULL) {
if (strlen(s) == supported_subprotocol_len &&
strncmp(s, supported_subprotocol, supported_subprotocol_len) == 0) {
ESP_LOGD(TAG, "Requested subprotocol supported: %s", s);
return true;
}
} while ((s = strtok_r(NULL, ", ", &rest)) != NULL);
s = strtok_r(NULL, ", ", &rest);
}
ESP_LOGW(TAG, "Sec-WebSocket-Protocol %s not supported, supported subprotocol is %s", subprotocol, supported_subprotocol);