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[83.57.170.138]) by smtp.gmail.com with ESMTPSA id yj16sm7623611ejb.122.2020.07.17.03.17.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jul 2020 03:17:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=uPtwKDDCa76VzRbbfDCizJwxl+rZegXzGw3EeNacAGE=; b=OBQmNZqaWjL7pkxtJvLtAEs5aQWM0/p6wCDFWNKJJAtEJEKvEeBuxZXRPvObTyxcd2 mxeJ+/09IqfwkIKo1sOW5I7UpRB72D82rRp1t80Q2DIU1hvuPMCdl1aPcNStYmk2YWzC zYygNVpJ3+2f96MgxNnzxwkSQJfSSMUmQofIi67MSgaBQds6N4ZHnUR8GkJ8PAHxs4TB SUOgBIk1n5SeUGWfbafhz2sAHSQ4cwZSzBJZhVCNwUfDTY9cNEU5vbXBui5b1pn5en/S zP44l9p3cNhncTDhQKXF4w4zK2pZx0GfDL5lpjUr4lthV/BgFUO6BvT29HlekaUs3R/N 9igg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; bh=uPtwKDDCa76VzRbbfDCizJwxl+rZegXzGw3EeNacAGE=; b=bjjTYC9EMkO8wW9LOhHpyewR21pvFrBL5NrrwEcYTzYlZ3tjlxyJrTsPfwfcUfqY8S KlMYWpCtP9hYPTZBKNxG70TnbaELDjwDrZsUoFEIm52kelO2wgf0ZvWVrBS8HJ3cbiRk 8xiCx9gV5ohYDding5HHJEmlWk8DGO50WctlhgtDrur5U1zQKxj9JMF4aoVDowKT/nZx l/K2DA9lagbTgt0qFD6elkTQxe4+it3X/HWvcbMYUVF7DX3j+4j0y/7P4jPGVWzdatGB QlyEKYcILAHO8a5UHekUlZv4ys0wZ86SMmZ3wqfyWOo5mdf7m5kKnDwx5oe3VbbY+gY4 g5Pw== X-Gm-Message-State: AOAM530OY+zxEw6B67EmzllzNyQkVFIQnSnPDkT1/qAZabZoPhgDLM9o 2Ut5JtkZXrRspucLs8RnZa5fCA/o+N8= X-Google-Smtp-Source: ABdhPJzvHUsXEWz1WmBC3HRQ5mW3ifvuB1J9FhShxzZS74RYd5VqNyhGZVj+jNZVTPYZheuUtd/BMA== X-Received: by 2002:a17:906:1f94:: with SMTP id t20mr7710210ejr.233.1594981021170; Fri, 17 Jul 2020 03:17:01 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [RFC PATCH-for-5.1] hw/ide: Avoid #DIV/0! FPU exception by setting CD-ROM sector count Date: Fri, 17 Jul 2020 12:16:59 +0200 Message-Id: <20200717101659.20031-1-f4bug@amsat.org> X-Mailer: git-send-email 2.21.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::641; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-ej1-x641.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: 0 X-Spam_score: 0.0 X-Spam_bar: / X-Spam_report: (0.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=1, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexander Bulekov , John Snow , Markus Armbruster , qemu-block@nongnu.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) libFuzzer found an undefined behavior (#DIV/0!) in ide_set_sector() when using a CD-ROM (reproducer available on the BugLink): UndefinedBehaviorSanitizer:DEADLYSIGNAL =3D=3D12163=3D=3DERROR: UndefinedBehaviorSanitizer: FPE on unknown addres= s 0x5616279cffdc (pc 0x5616279cffdc bp 0x7ffcdaabae90 sp 0x7ffcdaabae30 T12= 163) Fix by initializing the CD-ROM number of sectors in ide_dev_initfn(). Reported-by: Alexander Bulekov Fixes: b2df431407 ("ide scsi: Mess with geometry only for hard disk devices= ") BugLink: https://bugs.launchpad.net/qemu/+bug/1887309 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- hw/ide/qdev.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c index 27ff1f7f66..6ce7fc317c 100644 --- a/hw/ide/qdev.c +++ b/hw/ide/qdev.c @@ -201,6 +201,15 @@ static void ide_dev_initfn(IDEDevice *dev, IDEDriveKin= d kind, Error **errp) errp)) { return; } + } else { + uint64_t nb_sectors; + + blk_get_geometry(dev->conf.blk, &nb_sectors); + if (!nb_sectors) { + error_setg(errp, "CD-ROM size can not be zero"); + return; + } + dev->conf.secs =3D nb_sectors; } if (!blkconf_apply_backend_options(&dev->conf, kind =3D=3D IDE_CD, kind !=3D IDE_CD, errp)) { --=20 2.21.3