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 0A23B8F70 for ; Sun, 16 Jul 2023 19:54:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8424EC433C7; Sun, 16 Jul 2023 19:54:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689537283; bh=Xn0/SXd3oC4MEoGrp9tZs65bUlTo8nFdT+pLdGs2c/0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RlrIRmvDqSlvBzXlc3oUlgPsq7hZAmQQygj+lmnA+3T/KJKX3yeL84eMRot6KW0XG 8Aq5Hwh/j/lQh1/7sGij+ITxFZ9po2nQFrAuWvG5rLRvqzyaiOfDz30iBu99BjPkiM UMGZ9bC4mGYT4U4qaj/nWcWnqVRB6g0Vr9aQK7go= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yu Kuai , Christoph Hellwig , Jens Axboe , Sasha Levin Subject: [PATCH 6.4 041/800] block: fix blktrace debugfs entries leakage Date: Sun, 16 Jul 2023 21:38:14 +0200 Message-ID: <20230716194950.048187130@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230716194949.099592437@linuxfoundation.org> References: <20230716194949.099592437@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Yu Kuai [ Upstream commit dd7de3704af9989b780693d51eaea49a665bd9c2 ] Commit 99d055b4fd4b ("block: remove per-disk debugfs files in blk_unregister_queue") moves blk_trace_shutdown() from blk_release_queue() to blk_unregister_queue(), this is safe if blktrace is created through sysfs, however, there is a regression in corner case. blktrace can still be enabled after del_gendisk() through ioctl if the disk is opened before del_gendisk(), and if blktrace is not shutdown through ioctl before closing the disk, debugfs entries will be leaked. Fix this problem by shutdown blktrace in disk_release(), this is safe because blk_trace_remove() is reentrant. Fixes: 99d055b4fd4b ("block: remove per-disk debugfs files in blk_unregister_queue") Signed-off-by: Yu Kuai Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20230610022003.2557284-4-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/genhd.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/block/genhd.c b/block/genhd.c index 1cb489b927d50..bb895397e9385 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -25,8 +25,9 @@ #include #include #include -#include "blk-throttle.h" +#include +#include "blk-throttle.h" #include "blk.h" #include "blk-mq-sched.h" #include "blk-rq-qos.h" @@ -1171,6 +1172,8 @@ static void disk_release(struct device *dev) might_sleep(); WARN_ON_ONCE(disk_live(disk)); + blk_trace_remove(disk->queue); + /* * To undo the all initialization from blk_mq_init_allocated_queue in * case of a probe failure where add_disk is never called we have to -- 2.39.2