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Message-Id: <20240730030757.109700-1-cam.alvarez.i@gmail.com>
Date: Mon, 29 Jul 2024 23:07:58 -0400
From: Camila Alvarez <cam.alvarez.i@...il.com>
To: syzbot+916742d5d24f6c254761@...kaller.appspotmail.com
Cc: syzkaller-bugs@...glegroups.com,
linux-kernel@...r.kernel.org,
Camila Alvarez <cam.alvarez.i@...il.com>
Subject: [PATCH] usb: slab-use-after-free Read in hdm_disconnect
#syz test
All references on the device were lost when deregistering the interface. To make sure the device is not released before freeing all the memory we add get_device to increase the ref count by one.
Reported-by: syzbot+916742d5d24f6c254761@...kaller.appspotmail.com
Signed-off-by: Camila Alvarez <cam.alvarez.i@...il.com>
---
drivers/most/most_usb.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/most/most_usb.c b/drivers/most/most_usb.c
index 485d5ca39951..e178a5a0d3aa 100644
--- a/drivers/most/most_usb.c
+++ b/drivers/most/most_usb.c
@@ -1120,6 +1120,7 @@ static void hdm_disconnect(struct usb_interface *interface)
if (mdev->dci)
device_unregister(&mdev->dci->dev);
+ get_device(&mdev->dev);
most_deregister_interface(&mdev->iface);
kfree(mdev->busy_urbs);
--
2.34.1
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