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 C0EC56FA0 for ; Mon, 16 Jan 2023 17:03:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4735EC433F0; Mon, 16 Jan 2023 17:03:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673888611; bh=dsFG0BbKvjevPgPfJpQlUh0gSK9xoz+DpVGbvU7hmBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RChOSK2k/wbng5I7R3oxMxToFxLcNBvzqUUBG9JCb07sYFYYSc0H6l5V1UU7V8AGf sCwWf2GlHpED0TnfoikvHlBosg8UCHgbyg84Zn136KgpVyrOoLfuWS9gJ7UhfndNtq G0xkWy3qjJVpa/ZhIguje7EC3H5CMAhnLgqfaqOk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhang Xiaoxu , Miquel Raynal , Sasha Levin Subject: [PATCH 4.14 071/338] mtd: Fix device name leak when register device failed in add_mtd_device() Date: Mon, 16 Jan 2023 16:49:04 +0100 Message-Id: <20230116154823.969632617@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154820.689115727@linuxfoundation.org> References: <20230116154820.689115727@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: Zhang Xiaoxu [ Upstream commit 895d68a39481a75c680aa421546931fb11942fa6 ] There is a kmemleak when register device failed: unreferenced object 0xffff888101aab550 (size 8): comm "insmod", pid 3922, jiffies 4295277753 (age 925.408s) hex dump (first 8 bytes): 6d 74 64 30 00 88 ff ff mtd0.... backtrace: [<00000000bde26724>] __kmalloc_node_track_caller+0x4e/0x150 [<000000003c32b416>] kvasprintf+0xb0/0x130 [<000000001f7a8f15>] kobject_set_name_vargs+0x2f/0xb0 [<000000006e781163>] dev_set_name+0xab/0xe0 [<00000000e30d0c78>] add_mtd_device+0x4bb/0x700 [<00000000f3d34de7>] mtd_device_parse_register+0x2ac/0x3f0 [<00000000c0d88488>] 0xffffffffa0238457 [<00000000b40d0922>] 0xffffffffa02a008f [<0000000023d17b9d>] do_one_initcall+0x87/0x2a0 [<00000000770f6ca6>] do_init_module+0xdf/0x320 [<000000007b6768fe>] load_module+0x2f98/0x3330 [<00000000346bed5a>] __do_sys_finit_module+0x113/0x1b0 [<00000000674c2290>] do_syscall_64+0x35/0x80 [<000000004c6a8d97>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 If register device failed, should call put_device() to give up the reference. Fixes: 1f24b5a8ecbb ("[MTD] driver model updates") Signed-off-by: Zhang Xiaoxu Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20221022121352.2534682-1-zhangxiaoxu5@huawei.com Signed-off-by: Sasha Levin --- drivers/mtd/mtdcore.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index e7ea842ba3db..912b09f5d066 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -552,8 +552,10 @@ int add_mtd_device(struct mtd_info *mtd) dev_set_drvdata(&mtd->dev, mtd); of_node_get(mtd_get_of_node(mtd)); error = device_register(&mtd->dev); - if (error) + if (error) { + put_device(&mtd->dev); goto fail_added; + } if (!IS_ERR_OR_NULL(dfs_dir_mtd)) { mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(&mtd->dev), dfs_dir_mtd); -- 2.35.1