From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E07FC4332F for ; Sun, 18 Dec 2022 16:31:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232112AbiLRQbm (ORCPT ); Sun, 18 Dec 2022 11:31:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232108AbiLRQbB (ORCPT ); Sun, 18 Dec 2022 11:31:01 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF194140A6; Sun, 18 Dec 2022 08:11:14 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 30DBE60DD7; Sun, 18 Dec 2022 16:11:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2289C433B0; Sun, 18 Dec 2022 16:11:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1671379873; bh=2z+F95vK9xmILr9GtTPCrdh3zuzMsw/9bsWbAfXOKuc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tGQeAehNx43MOXhu27o50funEU8KdyGMk5TKGY8xXM0VWS0O7+4pEPMGypnp/f3sq nGhuNtkZxfH4TI5a9cQnGL9vWmbly8G6QIsLiCM5+iwPOS5aEj1dR3CQG0yjARGw3Q 7pOkXt9gQHLEz/t+h+klR7uQPQn15IZZ0EN6l81QG5kVvWZKXjRYuZ74ydF8TcX/Ku gbEYBOEVH+LjMHG4ZVWogPpqkugApPv7d46gCChpCR8wX6RB4dnwUMQJJtGM0yaOqA 733pR7NKL20Ci9EmPtdKU0CTTuMLWi/QzzcHqHrQbyeIZC222yCmSGX/X4EeLRnh1A FnmyNCwYOC9Xg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ye Bin , Ming Lei , Jens Axboe , Sasha Levin , linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 6.0 54/73] blk-mq: fix possible memleak when register 'hctx' failed Date: Sun, 18 Dec 2022 11:07:22 -0500 Message-Id: <20221218160741.927862-54-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221218160741.927862-1-sashal@kernel.org> References: <20221218160741.927862-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ye Bin [ Upstream commit 4b7a21c57b14fbcd0e1729150189e5933f5088e9 ] There's issue as follows when do fault injection test: unreferenced object 0xffff888132a9f400 (size 512): comm "insmod", pid 308021, jiffies 4324277909 (age 509.733s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 f4 a9 32 81 88 ff ff ...........2.... 08 f4 a9 32 81 88 ff ff 00 00 00 00 00 00 00 00 ...2............ backtrace: [<00000000e8952bb4>] kmalloc_node_trace+0x22/0xa0 [<00000000f9980e0f>] blk_mq_alloc_and_init_hctx+0x3f1/0x7e0 [<000000002e719efa>] blk_mq_realloc_hw_ctxs+0x1e6/0x230 [<000000004f1fda40>] blk_mq_init_allocated_queue+0x27e/0x910 [<00000000287123ec>] __blk_mq_alloc_disk+0x67/0xf0 [<00000000a2a34657>] 0xffffffffa2ad310f [<00000000b173f718>] 0xffffffffa2af824a [<0000000095a1dabb>] do_one_initcall+0x87/0x2a0 [<00000000f32fdf93>] do_init_module+0xdf/0x320 [<00000000cbe8541e>] load_module+0x3006/0x3390 [<0000000069ed1bdb>] __do_sys_finit_module+0x113/0x1b0 [<00000000a1a29ae8>] do_syscall_64+0x35/0x80 [<000000009cd878b0>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 Fault injection context as follows: kobject_add blk_mq_register_hctx blk_mq_sysfs_register blk_register_queue device_add_disk null_add_dev.part.0 [null_blk] As 'blk_mq_register_hctx' may already add some objects when failed halfway, but there isn't do fallback, caller don't know which objects add failed. To solve above issue just do fallback when add objects failed halfway in 'blk_mq_register_hctx'. Signed-off-by: Ye Bin Reviewed-by: Ming Lei Link: https://lore.kernel.org/r/20221117022940.873959-1-yebin@huaweicloud.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-mq-sysfs.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index 93997d297d42..4515288fbe35 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -185,7 +185,7 @@ static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; struct blk_mq_ctx *ctx; - int i, ret; + int i, j, ret; if (!hctx->nr_ctx) return 0; @@ -197,9 +197,16 @@ static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) hctx_for_each_ctx(hctx, ctx, i) { ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); if (ret) - break; + goto out; } + return 0; +out: + hctx_for_each_ctx(hctx, ctx, j) { + if (j < i) + kobject_del(&ctx->kobj); + } + kobject_del(&hctx->kobj); return ret; } -- 2.35.1