Patch "usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable()" has been added to the 6.7-stable tree

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This is a note to let you know that I've just added the patch titled

    usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable()

to the 6.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-cdns3-fixed-memory-use-after-free-at-cdns3_gadget_ep_disable.patch
and it can be found in the queue-6.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From cd45f99034b0c8c9cb346dd0d6407a95ca3d36f6 Mon Sep 17 00:00:00 2001
From: Frank Li <Frank.Li@xxxxxxx>
Date: Fri, 2 Feb 2024 10:42:16 -0500
Subject: usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable()

From: Frank Li <Frank.Li@xxxxxxx>

commit cd45f99034b0c8c9cb346dd0d6407a95ca3d36f6 upstream.

  ...
  cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request);
  list_del_init(&priv_req->list);
  ...

'priv_req' actually free at cdns3_gadget_ep_free_request(). But
list_del_init() use priv_req->list after it.

[ 1542.642868][  T534] BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xd4
[ 1542.642868][  T534]
[ 1542.653162][  T534] Use-after-free read at 0x000000009ed0ba99 (in kfence-#3):
[ 1542.660311][  T534]  __list_del_entry_valid+0x10/0xd4
[ 1542.665375][  T534]  cdns3_gadget_ep_disable+0x1f8/0x388 [cdns3]
[ 1542.671571][  T534]  usb_ep_disable+0x44/0xe4
[ 1542.675948][  T534]  ffs_func_eps_disable+0x64/0xc8
[ 1542.680839][  T534]  ffs_func_set_alt+0x74/0x368
[ 1542.685478][  T534]  ffs_func_disable+0x18/0x28

Move list_del_init() before cdns3_gadget_ep_free_request() to resolve this
problem.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx>
Acked-by: Peter Chen <peter.chen@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240202154217.661867-1-Frank.Li@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/cdns3/cdns3-gadget.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -2539,11 +2539,11 @@ static int cdns3_gadget_ep_disable(struc
 
 	while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
 		priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
+		list_del_init(&priv_req->list);
 
 		kfree(priv_req->request.buf);
 		cdns3_gadget_ep_free_request(&priv_ep->endpoint,
 					     &priv_req->request);
-		list_del_init(&priv_req->list);
 		--priv_ep->wa2_counter;
 	}
 


Patches currently in stable-queue which might be from Frank.Li@xxxxxxx are

queue-6.7/usb-cdns3-fix-memory-double-free-when-handle-zero-packet.patch
queue-6.7/usb-cdns3-fixed-memory-use-after-free-at-cdns3_gadget_ep_disable.patch




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