linux-kernel - [PATCH 4.14 0/2] usb: gadget: use after free in dev

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Message-Id: <20220301022608.10950-1-hbh25y@gmail.com>
Date:   Tue,  1 Mar 2022 10:26:06 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     stable@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, ben@...adent.org.uk,
        balbi@...nel.org, axboe@...nel.dk, mingo@...nel.org,
        jj251510319013@...il.com, zsm@...omium.org,
        stern@...land.harvard.edu, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH 4.14 0/2] usb: gadget: use after free in dev_config

Author: Hangyu Hua <hbh25y@...il.com>
commit 89f3594d0de5 ("usb: gadget: don't release an existing dev->buf")

Author: Hangyu Hua <hbh25y@...il.com>
commit 501e38a5531e ("usb: gadget: clear related members when goto fail")

Add two commits to all stable branches.

There are two bugs:
dev->buf does not need to be released if it already exists before
executing dev_config.
dev->config and dev->hs_config and dev->dev need to be cleaned if
dev_config fails to avoid UAF.

Hangyu Hua (2):
  usb: gadget: don't release an existing dev->buf
  usb: gadget: clear related members when goto fail

 drivers/usb/gadget/legacy/inode.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

-- 
2.25.1