USB: Check on the number of bytes to send to not send more than expected.

sylvainpelissier · sylvainpelissier · commit 456c0d528f2e · 2018-08-23T17:27:04.000+02:00
diff --git a/cores/arduino/USB/USBCore.cpp b/cores/arduino/USB/USBCore.cpp
@@ -229,6 +229,11 @@ int USBD_SendControl(uint8_t flags __attribute__ ((unused)), const void* d, uint
 
 	if (_cmark < _cend)
 	{
+	    if (_cmark + len > _cend)
+	    {
+	        len = _cend - _cmark;
+	        length = len;
+	    }
 		while (len > 0)
 		{
 			sent = UDD_Send(EP0, data + pos, len);

Original file line number	Diff line number	Diff line change
`@@ -229,6 +229,11 @@ int USBD_SendControl(uint8_t flags __attribute__ ((unused)), const void* d, uint`
`229`	`229`
`230`	`230`	`if (_cmark < _cend)`
`231`	`231`	`{`
	`232`	`+ if (_cmark + len > _cend)`
	`233`	`+ {`
	`234`	`+ len = _cend - _cmark;`
	`235`	`+ length = len;`
	`236`	`+ }`
`232`	`237`	`while (len > 0)`
`233`	`238`	`{`
`234`	`239`	`sent = UDD_Send(EP0, data + pos, len);`