From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B0EC330B03; Fri, 17 Oct 2025 15:43:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760715832; cv=none; b=odnvecv/1WutdVwwbj3mLVEczMe64kOYUt31YniRjzZ17BrJwAZaXg5ktcNfXhKjgsZcjkUQh+3BE+P1109EEuWMO8KjBCgZfnIdis72xtRAeUY3SeyHyOkN1DsD/z3mJedTYnnLiQkOktmUd6vxlWn75ExAtQbJU7n5aZV/OME= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760715832; c=relaxed/simple; bh=Xp/yCJnO1q4mvyMEzqfIDrln5bgSpv3TOub/ChXHYOY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u4jtN+iS6BhgZLtkcsFg/oD8A+7wLvY+Tl7vm3LRjvwCyY95XvygesO9Y5eU/AayHdGXj5z1VsyQt2Ux5c0y64xkAOJ6FaQPRyGyMi7RaBrszBAQTddF6UcAu8vnU/KFJG10AS3TtwfAvEiOCiJud2gfRjN+RBlWHKR0K6d/Qn0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Y51KM4BM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Y51KM4BM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8519AC4CEE7; Fri, 17 Oct 2025 15:43:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760715831; bh=Xp/yCJnO1q4mvyMEzqfIDrln5bgSpv3TOub/ChXHYOY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y51KM4BMdtL8XIkBORxWbPiKdOjIOMehafj0bpRPzZW7llxRE9E5xBKIBrpvSZQFp Zc1Q33tvSu5urKoZ832l2qP+rC512RzXo9InRKiSFfRivYJfcm/nBh0UtJ40TqYaPW fXg1fQ9E1lm+ac+28xSTiz2lapGzI+zijDPFSLqE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+031d0cfd7c362817963f@syzkaller.appspotmail.com, Edward Adam Davis , Sakari Ailus , Hans Verkuil , Sasha Levin Subject: [PATCH 6.17 353/371] media: mc: Clear minor number before put device Date: Fri, 17 Oct 2025 16:55:28 +0200 Message-ID: <20251017145214.856658637@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145201.780251198@linuxfoundation.org> References: <20251017145201.780251198@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Edward Adam Davis [ Upstream commit 8cfc8cec1b4da88a47c243a11f384baefd092a50 ] The device minor should not be cleared after the device is released. Fixes: 9e14868dc952 ("media: mc: Clear minor number reservation at unregistration time") Cc: stable@vger.kernel.org Reported-by: syzbot+031d0cfd7c362817963f@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=031d0cfd7c362817963f Tested-by: syzbot+031d0cfd7c362817963f@syzkaller.appspotmail.com Signed-off-by: Edward Adam Davis Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil [ moved clear_bit from media_devnode_release callback to media_devnode_unregister before put_device ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/media/mc/mc-devnode.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) --- a/drivers/media/mc/mc-devnode.c +++ b/drivers/media/mc/mc-devnode.c @@ -50,11 +50,6 @@ static void media_devnode_release(struct { struct media_devnode *devnode = to_media_devnode(cd); - mutex_lock(&media_devnode_lock); - /* Mark device node number as free */ - clear_bit(devnode->minor, media_devnode_nums); - mutex_unlock(&media_devnode_lock); - /* Release media_devnode and perform other cleanups as needed. */ if (devnode->release) devnode->release(devnode); @@ -281,6 +276,7 @@ void media_devnode_unregister(struct med /* Delete the cdev on this minor as well */ cdev_device_del(&devnode->cdev, &devnode->dev); devnode->media_dev = NULL; + clear_bit(devnode->minor, media_devnode_nums); mutex_unlock(&media_devnode_lock); put_device(&devnode->dev);