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 85550C433F5 for ; Wed, 24 Nov 2021 13:03:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345696AbhKXNGi (ORCPT ); Wed, 24 Nov 2021 08:06:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:46520 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345470AbhKXNEn (ORCPT ); Wed, 24 Nov 2021 08:04:43 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1BEF361A04; Wed, 24 Nov 2021 12:37:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637757429; bh=ba7OJ5zJD3+qN5ry1QYNEeab3gpRjeaTarwoS8KfAUE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OyCgk6CIq092+Fkf3nD7Urhcgyg2C9kpSPzE0065dq0DNxfZ+PUgoj3suRACBQFmM d3cCRsrEbqz/1B2ZXqoPlVCAszJcSXSWlWRG2QkNoY/jhVDj+yYirOpQLkHam0Bchv Xk1W53cOs2NlxSgQhPzQFjB3WcJDRj4Jz+8ipGMg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tiezhu Yang , Masami Hiramatsu , "Steven Rostedt (VMware)" , Sasha Levin Subject: [PATCH 4.19 166/323] samples/kretprobes: Fix return value if register_kretprobe() failed Date: Wed, 24 Nov 2021 12:55:56 +0100 Message-Id: <20211124115724.548321941@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115718.822024889@linuxfoundation.org> References: <20211124115718.822024889@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tiezhu Yang [ Upstream commit f76fbbbb5061fe14824ba5807c44bd7400a6b4e1 ] Use the actual return value instead of always -1 if register_kretprobe() failed. E.g. without this patch: # insmod samples/kprobes/kretprobe_example.ko func=no_such_func insmod: ERROR: could not insert module samples/kprobes/kretprobe_example.ko: Operation not permitted With this patch: # insmod samples/kprobes/kretprobe_example.ko func=no_such_func insmod: ERROR: could not insert module samples/kprobes/kretprobe_example.ko: Unknown symbol in module Link: https://lkml.kernel.org/r/1635213091-24387-2-git-send-email-yangtiezhu@loongson.cn Fixes: 804defea1c02 ("Kprobes: move kprobe examples to samples/") Signed-off-by: Tiezhu Yang Acked-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Sasha Levin --- samples/kprobes/kretprobe_example.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c index 7f9060f435cde..da6de5e78e1dd 100644 --- a/samples/kprobes/kretprobe_example.c +++ b/samples/kprobes/kretprobe_example.c @@ -83,7 +83,7 @@ static int __init kretprobe_init(void) ret = register_kretprobe(&my_kretprobe); if (ret < 0) { pr_err("register_kretprobe failed, returned %d\n", ret); - return -1; + return ret; } pr_info("Planted return probe at %s: %p\n", my_kretprobe.kp.symbol_name, my_kretprobe.kp.addr); -- 2.33.0