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FAILED: patch "[PATCH] USB: serial: io_edgeport: handle unbound ports on URB" failed to apply to 4.9-stable tree

PATCH [email protected] 1 participant 1 message Jan 19, 2020

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Stable branch USB USB serial
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The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e37d1aeda737a20b1846a91a3da3f8b0f00cf690 Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Fri, 17 Jan 2020 10:50:23 +0100
Subject: [PATCH] USB: serial: io_edgeport: handle unbound ports on URB
completion

Check for NULL port data in the shared interrupt and bulk completion callbacks to avoid dereferencing a NULL pointer in case a device sends data for a port device which isn't bound to a driver (e.g. due to a malicious device having unexpected endpoints or after an allocation failure on port probe).

Fixes 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc stable <[email protected]>
Reviewed-by Greg Kroah-Hartman <[email protected]>
Signed-off-by Johan Hovold <[email protected]>
drivers/usb/serial/io_edgeport.c +2 -2
index 9690a5f4b9d6..0582d78bdb1d 100644
@@ -716,7 +716,7 @@ static void edge_interrupt_callback(struct urb *urb)
 			if (txCredits) {
 				port = edge_serial->serial->port[portNumber];
 				edge_port = usb_get_serial_port_data(port);
-				if (edge_port->open) {
+				if (edge_port && edge_port->open) {
 					spin_lock_irqsave(&edge_port->ep_lock,
 							  flags);
 					edge_port->txCredits += txCredits;

@@ -1825,7 +1825,7 @@ static void process_rcvd_data(struct edgeport_serial *edge_serial,
 				port = edge_serial->serial->port[
 							edge_serial->rxPort];
 				edge_port = usb_get_serial_port_data(port);
-				if (edge_port->open) {
+				if (edge_port && edge_port->open) {
 					dev_dbg(dev, "%s - Sending %d bytes to TTY for port %d\n",
 						__func__, rxLen,
 						edge_serial->rxPort);