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 69005C0032E for ; Mon, 23 Oct 2023 02:46:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233201AbjJWCqc (ORCPT ); Sun, 22 Oct 2023 22:46:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229481AbjJWCq3 (ORCPT ); Sun, 22 Oct 2023 22:46:29 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FAE7DB; Sun, 22 Oct 2023 19:46:28 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id d9443c01a7336-1cacde97002so13130625ad.2; Sun, 22 Oct 2023 19:46:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698029187; x=1698633987; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=HQc98ygW3JLH42W3zhpB97VN01RLRDxHg6oT7E9O25I=; b=H5y4JAOjGyldnWkTB5K9YPjM+gM+dlRdI98jek4ccCmB2ESWyXP5eQ27RTVCoD5IEz u+tas+VpGfQVg6+DwgQf5sEJqc5sbloAeYnlCjEnUZfWu2xyvvnxvYvWDYS/hqsbFxee vIZC67evt59ZkGyF8QtqRZYqCNHPYHhu/oRu4xjdsnBVbb/xqq84tN30S33ZGpF40HjE hjDBSpChZYvRcaDzxUOXQstEPMnGB/yK8gZxDksqg59Ax3MWcMhGF89hLUExW4+MtSCj O1RrJoCyS4U2N223BD65iTADCza7WE2um1XjOjgWf7DFeKfdPMtX6abAgS69WHyjWBbq h0RA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698029187; x=1698633987; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=HQc98ygW3JLH42W3zhpB97VN01RLRDxHg6oT7E9O25I=; b=i5qPA2Xwvh/MbVI1T4XsZhqO4mP2375m+fLZOcQnWmgkw55rJQccydoq2kvxZsuqVN +MuHaQd3TLXmz1SKixquuxljq3xt1gqXFGUgNrPy1cCdc4Qhk9zw+N0DcRktlnNcGBrF S1ZtOyA3ujBu42RSEEXbtjf0PZebh3yGvFeDlipa7ChjO46z8l6DoyoTfZaMq0mfdFKz KYIejyKL3y++JmDvu4ZsCVZ1AdoR7RWGx+6VBe166cYQd5YED4hqWG+8ggX9Vf3lygIk vpAgSoPXA3ukIYX7TOJY9pxdl9KR97UxsHNap94NAdRVDo9HJKKALrU9L8nY3K6HP1sF 0DFA== X-Gm-Message-State: AOJu0YwB3rjzdTCd51N8B2AEOSrS9b/5IPyVK4zoR7uTubDXN4Ddedl+ G017VG5JC+UqMbUzIkwwTIjB5ta6fbgHDw== X-Google-Smtp-Source: AGHT+IHNn4PQ/fdf1Gn5Ydr4cBx5xYUk3BPGPRSzdZ3Th2zqPumSc531z2wlOXGLhgZRtaN3qYZK2Q== X-Received: by 2002:a17:903:22c7:b0:1ca:8e79:53af with SMTP id y7-20020a17090322c700b001ca8e7953afmr6247201plg.3.1698029187468; Sun, 22 Oct 2023 19:46:27 -0700 (PDT) Received: from pek-lxu-l1.wrs.com ([111.198.228.56]) by smtp.gmail.com with ESMTPSA id e12-20020a170902ed8c00b001ba066c589dsm5022017plj.137.2023.10.22.19.46.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Oct 2023 19:46:26 -0700 (PDT) From: Edward AD To: syzbot+9704e6f099d952508943@syzkaller.appspotmail.com Cc: davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, reibax@gmail.com, richardcochran@gmail.com, syzkaller-bugs@googlegroups.com Subject: [PATCH] ptp: ptp_read should not release queue Date: Mon, 23 Oct 2023 10:46:23 +0800 Message-ID: <20231023024622.323905-2-twuufnxlz@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <0000000000002e8d4a06085267f3@google.com> References: <0000000000002e8d4a06085267f3@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Firstly, queue is not the memory allocated in ptp_read; Secondly, other processes may block at ptp_read and wait for conditions to be met to perform read operations. Reported-and-tested-by: syzbot+9704e6f099d952508943@syzkaller.appspotmail.com Fixes: 8f5de6fb2453 ("ptp: support multiple timestamp event readers") Signed-off-by: Edward AD --- drivers/ptp/ptp_chardev.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index 282cd7d24077..27c1ef493617 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -585,7 +585,5 @@ ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags, free_event: kfree(event); exit: - if (result < 0) - ptp_release(pccontext); return result; } -- 2.25.1