Fix for issue adafruit#7054 by avoiding recursive calls to websocket_background.

DavePutz · dhalbert · commit a2cb953eac8f · 2023-03-09T11:07:36.000-05:00
diff --git a/supervisor/shared/web_workflow/websocket.c b/supervisor/shared/web_workflow/websocket.c
@@ -52,6 +52,8 @@ typedef struct {
 // interrupt character.
 STATIC ringbuf_t _incoming_ringbuf;
 STATIC uint8_t _buf[16];
+// make sure background is not called recursively
+STATIC bool in_web_background = false;
 
 static _websocket cp_serial;
 
@@ -244,6 +246,10 @@ void websocket_background(void) {
     if (!websocket_connected()) {
         return;
     }
+    if (in_web_background) {
+        return;
+    }
+    in_web_background = true;
     uint8_t c;
     while (ringbuf_num_empty(&_incoming_ringbuf) > 0 &&
            _read_next_payload_byte(&c)) {
@@ -253,4 +259,5 @@ void websocket_background(void) {
         }
         ringbuf_put(&_incoming_ringbuf, c);
     }
+    in_web_background = false;
 }

Original file line number	Diff line number	Diff line change
`@@ -52,6 +52,8 @@ typedef struct {`
`52`	`52`	`// interrupt character.`
`53`	`53`	`STATIC ringbuf_t _incoming_ringbuf;`
`54`	`54`	`STATIC uint8_t _buf[16];`
	`55`	`+// make sure background is not called recursively`
	`56`	`+STATIC bool in_web_background = false;`
`55`	`57`
`56`	`58`	`static _websocket cp_serial;`
`57`	`59`
`@@ -244,6 +246,10 @@ void websocket_background(void) {`
`244`	`246`	`if (!websocket_connected()) {`
`245`	`247`	`return;`
`246`	`248`	`}`
	`249`	`+ if (in_web_background) {`
	`250`	`+ return;`
	`251`	`+ }`
	`252`	`+ in_web_background = true;`
`247`	`253`	`uint8_t c;`
`248`	`254`	`while (ringbuf_num_empty(&_incoming_ringbuf) > 0 &&`
`249`	`255`	`_read_next_payload_byte(&c)) {`
`@@ -253,4 +259,5 @@ void websocket_background(void) {`
`253`	`259`	`}`
`254`	`260`	`ringbuf_put(&_incoming_ringbuf, c);`
`255`	`261`	`}`
	`262`	`+ in_web_background = false;`
`256`	`263`	`}`