diff mbox series

USB: gl620a: check for rx buffer overflow

Message ID 20231121134315.18721-1-oneukum@suse.com
State Superseded
Headers show
Series USB: gl620a: check for rx buffer overflow | expand

Commit Message

Oliver Neukum Nov. 21, 2023, 1:43 p.m. UTC 
The driver checks for a single package overflowing
maximum size. That needs to be done, but it is not
enough. As a single transmission can contain a high
number of packets, we also need to check whether
the aggregate of messages in itself short enough
overflow the buffer.
That is easiest done by checking that the current
packet does not overflow the buffer.

Signed-off-ny: Oliver Neukum <oneukum@suse.com>
---
 drivers/net/usb/gl620a.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/usb/gl620a.c b/drivers/net/usb/gl620a.c
index 46af78caf457..d33ae15abdc1 100644
--- a/drivers/net/usb/gl620a.c
+++ b/drivers/net/usb/gl620a.c
@@ -104,6 +104,10 @@  static int genelink_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 			return 0;
 		}
 
+		/* we also need to check for overflowing the buffer */
+		if (size > skb->len)
+			return 0;
+
 		// allocate the skb for the individual packet
 		gl_skb = alloc_skb(size, GFP_ATOMIC);
 		if (gl_skb) {