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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 06406C369D9 for ; Wed, 30 Apr 2025 15:49:01 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uA9ej-0003Ih-5j; Wed, 30 Apr 2025 11:47:29 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uA9ee-0003Fv-Hx for qemu-devel@nongnu.org; Wed, 30 Apr 2025 11:47:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uA9ec-0000sp-Au for qemu-devel@nongnu.org; Wed, 30 Apr 2025 11:47:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1746028041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/SXVVHJXOclrV29LpyodIqW3sJ9wZXDE8Gyt0H51cYg=; b=E3c4S16Fqe/C+BCIS+ovORj1IcbQu3O9J/1HjfGNmcSC7jz8mWoByq1Xm5VHjZj2EElzu4 FMxDjIYtGmajRtmx49EP43LYUKv14NY3NboRuHuVI4kicGAZVQ6sxTOI1NoMqv4PFPypPb aDr9hal6RruEsV9V1R7K9m9hXFM/TRI= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-376-eY1SampeNI6iPntixGi5BA-1; Wed, 30 Apr 2025 11:47:17 -0400 X-MC-Unique: eY1SampeNI6iPntixGi5BA-1 X-Mimecast-MFC-AGG-ID: eY1SampeNI6iPntixGi5BA_1746028036 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 8F3A018004A7; Wed, 30 Apr 2025 15:47:16 +0000 (UTC) Received: from localhost (unknown [10.2.17.53]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id E753819560A3; Wed, 30 Apr 2025 15:47:15 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Hanna Czenczek , Kevin Wolf , Stefan Hajnoczi , Eric Blake Subject: [PULL 1/1] file-posix: Fix crash on discard_granularity == 0 Date: Wed, 30 Apr 2025 11:47:12 -0400 Message-ID: <20250430154712.57125-2-stefanha@redhat.com> In-Reply-To: <20250430154712.57125-1-stefanha@redhat.com> References: <20250430154712.57125-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.483, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Kevin Wolf Block devices that don't support discard have a discard_granularity of 0. Currently, this results in a division by zero when we try to make sure that it's a multiple of request_alignment. Only try to update bs->bl.pdiscard_alignment when we got a non-zero discard_granularity from sysfs. Fixes: f605796aae4 ('file-posix: probe discard alignment on Linux block devices') Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi Reviewed-by: Eric Blake Message-ID: <20250429155654.102735-1-kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi --- block/file-posix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index 0d6e12f880..0d85123d0f 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1573,7 +1573,7 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp) int ret; ret = hdev_get_pdiscard_alignment(&st, &dalign); - if (ret == 0) { + if (ret == 0 && dalign != 0) { uint32_t ralign = bs->bl.request_alignment; /* Probably never happens, but handle it just in case */ -- 2.49.0