From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 8134B2E7379; Sat, 30 May 2026 17:36:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780162564; cv=none; b=sRkIG5EXPkPCkOrfyZZesmRCPgo0WBTOJlXscWIoYoLkyRsSbnOXkP9XA/QIwltej5IhNFrI8N/+nOnMdSAcVEAqQGO0pVl/ObKhkuhUHTbhD9begiCQ2IObaNwtItunXEjwB0Ov9KvEVF3sGrb6eUSsZyBsKURsQnVwEZEHziI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780162564; c=relaxed/simple; bh=oRq7sAwJH6Qr0FYQINAE9Z7apg0HcZj7eHy8S2Xid40=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SRI6mYLrepw6/Qjg9Cfqt2x4iUTxQeE+rnU2Ue5/bajV4eRAzND4EUvAWLsSgUvRi92TrnXfbKqneip+CCdAd/EcH0MwcDke8HEaU6DDGKOwm66eHXAneZKx4k/UzXQlnd+A0uwXWgm1ig/AaJkkpINz1vVfwkB0dCHAxGnc/ag= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZcFGReWG; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZcFGReWG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5B721F00893; Sat, 30 May 2026 17:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780162563; bh=UhX0twbwwdfIEFbwTNhL3XGC6QpbziNK7InQpzc0gAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZcFGReWGPxVipF2bW4p5MWPc8qLXdR7VzW6DdIAK8ZTj1sKQyb58bQhav1cb/Ws2r 7OX4esr0H8s8ADKtKVKmn8ry69G0oPtS4SUqxB7Bvo+GbXO2zL1QFYwpFC0W/pLuSW FSUrMhSzLv5GaC9k0UG36QJwnOGJ1cdR40SblWns= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guangshuo Li , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.1 960/969] RDMA/rtrs: Fix use-after-free in path file creation cleanup Date: Sat, 30 May 2026 18:08:04 +0200 Message-ID: <20260530160327.281755425@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160300.485627683@linuxfoundation.org> References: <20260530160300.485627683@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guangshuo Li [ Upstream commit 5b74373390113fba798a76b483837029ab010fef ] In the error path of rtrs_srv_create_path_files(), the sysfs root folders may already have been created and srv_path->kobj may already have been initialized. If a later step fails, the cleanup currently calls kobject_put(&srv_path->kobj) before rtrs_srv_destroy_once_sysfs_root_folders(srv_path). kobject_put() may drop the last reference to srv_path->kobj and invoke the release callback, rtrs_srv_release(), which frees srv_path. The following call to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then dereferences srv_path internally to access srv_path->srv, resulting in a use-after-free. This failure path is reached before rtrs_srv_create_path_files() returns success, so the successful-path lifetime handling is not involved. Fix this by destroying the sysfs root folders before calling kobject_put(&srv_path->kobj), so srv_path is still valid while the helper accesses it. This issue was found by a static analysis tool I am developing. Fixes: ae4c81644e91 ("RDMA/rtrs-srv: Rename rtrs_srv_sess to rtrs_srv_path") Signed-off-by: Guangshuo Li Link: https://patch.msgid.link/20260514113834.865530-1-lgs201920130244@gmail.com Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c index 2a3c9ac64a42e..fade349daf39e 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c @@ -296,8 +296,8 @@ int rtrs_srv_create_path_files(struct rtrs_srv_path *srv_path) put_kobj: kobject_del(&srv_path->kobj); destroy_root: - kobject_put(&srv_path->kobj); rtrs_srv_destroy_once_sysfs_root_folders(srv_path); + kobject_put(&srv_path->kobj); return err; } -- 2.53.0