From patchwork Thu Jun 29 14:13:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13297061 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 C7B07EB64D9 for ; Thu, 29 Jun 2023 14:13:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231395AbjF2ONn (ORCPT ); Thu, 29 Jun 2023 10:13:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54844 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230119AbjF2ONn (ORCPT ); Thu, 29 Jun 2023 10:13:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59E2C10F8; Thu, 29 Jun 2023 07:13:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E456661549; Thu, 29 Jun 2023 14:13:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4CA63C433C8; Thu, 29 Jun 2023 14:13:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688048021; bh=9MwUN893Ig8ehSU507eveoN1wJ9s9BdAYtp6F4n2bGA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=efCckezHD5t9FmZAUmE/G2pFeQXeI9d3uX4gH96AyWHp6aTYseK7bpZntlrhgwhLe in3pswAMBLdxO4CX8DWSOTWdjOPeFX/pfzN8MNp4X1TC+hcuweA9senDo6MTc2LKmB +j4V4LNTYym0OfNwpBPx1aEPA+3lqBAXS5R9xgJMt8YfzPiQG0eyog5ETZRpCbCWCD CHyUFBez43BtRevcv9BefDm5P5tJl8VRSPaCL8AsACrDQC2k3LikHHGi0pZQheYDaU lTWEJO5cAeNtxxloigE0P50tJmQ+DE+qlEAswiCI/RCBCBsnfvTlQQftK9kjuRyUvE 5Bo6qpBLO6kQg== From: "Masami Hiramatsu (Google)" To: Steven Rostedt Cc: Dan Carpenter , linux-trace-kernel@vger.kernel.org, LKML , Masami Hiramatsu Subject: [PATCH 1/2] tracing/probes: Fix to avoid double count of the string length on the array Date: Thu, 29 Jun 2023 23:13:37 +0900 Message-ID: <168804801788.2028538.4620519547242506783.stgit@mhiramat.roam.corp.google.com> X-Mailer: git-send-email 2.41.0.162.gfafddb0af9-goog In-Reply-To: <8819b154-2ba1-43c3-98a2-cbde20892023@moroto.mountain> References: <8819b154-2ba1-43c3-98a2-cbde20892023@moroto.mountain> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org From: Masami Hiramatsu (Google) If there is an array is specified with the ustring or symstr, the length of the strings are accumlated on both of 'ret' and 'total', which means the length is double counted. Just set the length to the 'ret' value to aviud double count. Reported-by: Dan Carpenter Closes: https://lore.kernel.org/all/8819b154-2ba1-43c3-98a2-cbde20892023@moroto.mountain/ Fixes: 88903c464321 ("tracing/probe: Add ustring type for user-space string") Cc: stable@vger.kernel.org Signed-off-by: Masami Hiramatsu (Google) Reviewed-by: Steven Rostedt (Google) --- kernel/trace/trace_probe_tmpl.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_probe_tmpl.h b/kernel/trace/trace_probe_tmpl.h index 00707630788d..4735c5cb76fa 100644 --- a/kernel/trace/trace_probe_tmpl.h +++ b/kernel/trace/trace_probe_tmpl.h @@ -156,11 +156,11 @@ process_fetch_insn_bottom(struct fetch_insn *code, unsigned long val, code++; goto array; case FETCH_OP_ST_USTRING: - ret += fetch_store_strlen_user(val + code->offset); + ret = fetch_store_strlen_user(val + code->offset); code++; goto array; case FETCH_OP_ST_SYMSTR: - ret += fetch_store_symstrlen(val + code->offset); + ret = fetch_store_symstrlen(val + code->offset); code++; goto array; default: