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From: Jeffin Philip <jeffinphilip14@gmail.com>
To: jeffinphilip14@gmail.com
Cc: gregkh@linuxfoundation.org, i@zenithal.me,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	shuah@kernel.org, stable@vger.kernel.org,
	syzbot+af76b01c9a0f0ab60fb0@syzkaller.appspotmail.com,
	valentina.manea.m@gmail.com
Subject: Re: [PATCH] usbip: usbip_host: Fix null pointer dereference in rebind_store
Date: Thu,  6 Aug 2026 10:57:26 +0530	[thread overview]
Message-ID: <20260806052726.24793-1-jeffinphilip14@gmail.com> (raw)
In-Reply-To: <20260806051726.24343-1-jeffinphilip14@gmail.com>

On 06 Aug 2026, 05:17 UTC, Jeffin Philip wrote:

>rebind_store calls do_rebind which dereferences udev without
>checking if it is NULL. If busid is registered using match_busid
>but the device is not present in the first place, it triggers a
>null pointer dereference when we attempt to rebind the device.
>Fix this by checking explicitly for udev first and returning
>-ENODEV if udev is NULL.

Reproduce the issue using:
echo "add 1-1" > /sys/bus/usb/drivers/usbip-host/match_busid
echo "1-1" > /sys/bus/usb/drivers/usbip-host/rebind

Thanks,
Jeffin

  reply	other threads:[~2026-08-06  5:27 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-06  5:17 [PATCH] usbip: usbip_host: Fix null pointer dereference in rebind_store Jeffin Philip
2026-08-06  5:27 ` Jeffin Philip [this message]
2026-08-06  5:27 ` Greg KH
2026-08-06  5:36   ` Jeffin Philip
2026-08-06  5:42     ` Greg KH
2026-08-06 17:25       ` Jeffin Philip

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