From patchwork Tue Apr 7 10:21:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 11477861 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 939CE81 for ; Tue, 7 Apr 2020 10:29:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72BE72074B for ; Tue, 7 Apr 2020 10:29:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586255343; bh=kbZl1uDjGDqe9P85bbeC5tlO3WXKxc6I56W8sgaOY54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gvcPOpva7piuDqGclrdoDPrLGpuwosR7nahP9z3/z8Goem5caUa+Gz4aUsgYy7inv XxyD/WGjyqe/nBzVrUdqVr6WKag03x+Hk4Dt047iP2Vjdht7ixXxI+XKtAm6d4unsE l+G4g0VC9iGbu4XRtrI4AV/SC26a1IdWxcp0Qh0I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728734AbgDGKYc (ORCPT ); Tue, 7 Apr 2020 06:24:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:34728 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728727AbgDGKY2 (ORCPT ); Tue, 7 Apr 2020 06:24:28 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4BED82074F; Tue, 7 Apr 2020 10:24:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586255067; bh=kbZl1uDjGDqe9P85bbeC5tlO3WXKxc6I56W8sgaOY54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C7ZA8P+F1wM/Zwvg3hVVuKJm40PLWedTkOn6Gb9bM4HiFDN58BDqdmr03vuIvc6/+ p25bSMeLcnhimWz25nMI5dTdw4azOVTI7tgVlhofr4J/PmYWjizdD028qsS1uozYyu LwleJr5i1bEA3hHpEKE8vWbsr5BPqk3qq1s0zS/Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Geert Uytterhoeven , Daniel Jordan , Herbert Xu , Steffen Klassert , linux-crypto@vger.kernel.org, Sasha Levin Subject: [PATCH 5.5 17/46] padata: fix uninitialized return value in padata_replace() Date: Tue, 7 Apr 2020 12:21:48 +0200 Message-Id: <20200407101501.345016605@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200407101459.502593074@linuxfoundation.org> References: <20200407101459.502593074@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Daniel Jordan [ Upstream commit 41ccdbfd5427bbbf3ed58b16750113b38fad1780 ] According to Geert's report[0], kernel/padata.c: warning: 'err' may be used uninitialized in this function [-Wuninitialized]: => 539:2 Warning is seen only with older compilers on certain archs. The runtime effect is potentially returning garbage down the stack when padata's cpumasks are modified before any pcrypt requests have run. Simplest fix is to initialize err to the success value. [0] http://lkml.kernel.org/r/20200210135506.11536-1-geert@linux-m68k.org Reported-by: Geert Uytterhoeven Fixes: bbefa1dd6a6d ("crypto: pcrypt - Avoid deadlock by using per-instance padata queues") Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- kernel/padata.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/padata.c b/kernel/padata.c index fda7a7039422d..7bd37dd9ec55b 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -516,7 +516,7 @@ static int padata_replace(struct padata_instance *pinst) { int notification_mask = 0; struct padata_shell *ps; - int err; + int err = 0; pinst->flags |= PADATA_RESET;