From patchwork Tue Aug 27 18:56:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 13780060 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CFCB11D460A for ; Tue, 27 Aug 2024 18:56:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724784996; cv=none; b=c2KkPB6O6B3ZjJ6h+cvHjsJim+F6sUzhH+QV+tMPnu6+sg26C28T35fvd6AI0wCiTHBH95SqX4Ngtx030gkzCc2ulEVnQ6bR6VUHz7xqTvXJp1CcoMSrUNg5hujh0eGyg6y2D4tOxX8oHOhEltOy0EB3v7pkcaNaPHcbIkZ9GXM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724784996; c=relaxed/simple; bh=JMbg4eMibkjbCBRT/iJAl8N9RNBguY/qcuyAy9Bi6uc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bkXEGmeIkGzl7GcjvOtONYt9y4pmVIaiTfnBRT/tB3NHvvxkgXAPOgqrbKtz4D24+KqILbrzB8O+2KzX+dvkXhB2NA7d3iimvKw6TcgRypsCEsTroAjxVVkHlUhFBBppNXfJXG9SawcfWMIEYJ+lgAgi9i/fhcyAUQyEaNL+0N0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=jVQRp7Ob; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="jVQRp7Ob" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1724784993; 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=326BlglD5Q8k45ugPSVf+4k9+mzBOEJ61jidx8Y66gA=; b=jVQRp7ObtDJz7kJZFDkwuadXr0Hr8zB1o81O+jrsXxU+l/Afuz5Cjjs7fvQdG7+I8yBnrB I1990eAWo6HIBYwADfDRQ4NwaVqzW53352HSAD47z/eQ/Hp3HvTGi+pk+I+hh9yvxPWTZc MKqvEEmuMreorkR4yhn4ookvfUIsHpc= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-679-oomMaYoROtSxaec11yUPyA-1; Tue, 27 Aug 2024 14:56:31 -0400 X-MC-Unique: oomMaYoROtSxaec11yUPyA-1 Received: by mail-ej1-f72.google.com with SMTP id a640c23a62f3a-a7bcaa94892so521696266b.0 for ; Tue, 27 Aug 2024 11:56:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724784990; x=1725389790; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=326BlglD5Q8k45ugPSVf+4k9+mzBOEJ61jidx8Y66gA=; b=oBFY1NTbCexJYQerU9nBe1XIphq8gLH/7eOfelXBAzfcEQ/A3n8VA5mGcX9MjEh54z scHiiBA7NCOKrPU159mn0UK8udD3VOe8Om9KeyOl1o4WTauW2IrpJ5ODvi72yCrjLGXk DQE2uujCD9fs+xnn6uYzi05cQfknPO/ZmmumnJBoOMFDbbtmdXHfxJm/NkqcP/IhXpRf doM9SUUg8BgQNOYhYFAuS/uXmJ1w0Y7L/drxhJETApKL2vm/yYscKPGZehQxDxYdLZCq F2S7btzis79zGjqErZE3/gdnrzlZADZ9lHRzSPFLKCaE2LceQQExMjx0EUBvgj0BOEVr vuyQ== X-Forwarded-Encrypted: i=1; AJvYcCVRS/8tel1y93hmYgw2oM6VXbQ7gLNAXJLzJKx/cViZaMVyEV+gM6chXC2zkodeYJxfG1yQrP8=@vger.kernel.org X-Gm-Message-State: AOJu0YyC+IUuODN67EawLTcXnm9FyS3/VDGk06PnSXz79dT8C3KVaboK q6ExSJkeAQN8/PACYyQr6zCerkRnjCQudg1osWJbZeQUDaDbg8hMu0AC3uNwmxxw9Nkl/cJVMCa 6R87nCJTutCcO0RIGVcifRHyC8yenfmdffgW6jvGTHfRfdtrx1sU/Dg== X-Received: by 2002:a17:907:7295:b0:a86:97c0:9bb3 with SMTP id a640c23a62f3a-a86a54b8d24mr1205129566b.51.1724784990400; Tue, 27 Aug 2024 11:56:30 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF3LQz+Ovtpn7UQw3Ih17gexf8/42HNMXwzrnqKpk9+fwQeRpCxA2TD7y7c22AXPuu4p6dfJQ== X-Received: by 2002:a17:907:7295:b0:a86:97c0:9bb3 with SMTP id a640c23a62f3a-a86a54b8d24mr1205127066b.51.1724784989954; Tue, 27 Aug 2024 11:56:29 -0700 (PDT) Received: from eisenberg.fritz.box ([2001:16b8:3dbc:3c00:460c:db7e:8195:ddb5]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a86e549c4e9sm141473066b.47.2024.08.27.11.56.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Aug 2024 11:56:29 -0700 (PDT) From: Philipp Stanner To: ens Axboe , Wu Hao , Tom Rix , Moritz Fischer , Xu Yilun , Andy Shevchenko , Linus Walleij , Bartosz Golaszewski , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Bjorn Helgaas , Alvaro Karsz , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , Richard Cochran , Damien Le Moal , Hannes Reinecke , Keith Busch , Philipp Stanner Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fpga@vger.kernel.org, linux-gpio@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, virtualization@lists.linux.dev, stable@vger.kernel.org, Christophe JAILLET Subject: [PATCH v4 6/7] vdpa: solidrun: Fix UB bug with devres Date: Tue, 27 Aug 2024 20:56:11 +0200 Message-ID: <20240827185616.45094-7-pstanner@redhat.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240827185616.45094-1-pstanner@redhat.com> References: <20240827185616.45094-1-pstanner@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In psnet_open_pf_bar() and snet_open_vf_bar() a string later passed to pcim_iomap_regions() is placed on the stack. Neither pcim_iomap_regions() nor the functions it calls copy that string. Should the string later ever be used, this, consequently, causes undefined behavior since the stack frame will by then have disappeared. Fix the bug by allocating the strings on the heap through devm_kasprintf(). Cc: stable@vger.kernel.org # v6.3 Fixes: 51a8f9d7f587 ("virtio: vdpa: new SolidNET DPU driver.") Reported-by: Christophe JAILLET Closes: https://lore.kernel.org/all/74e9109a-ac59-49e2-9b1d-d825c9c9f891@wanadoo.fr/ Suggested-by: Andy Shevchenko Signed-off-by: Philipp Stanner --- drivers/vdpa/solidrun/snet_main.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet_main.c index 99428a04068d..c8b74980dbd1 100644 --- a/drivers/vdpa/solidrun/snet_main.c +++ b/drivers/vdpa/solidrun/snet_main.c @@ -555,7 +555,7 @@ static const struct vdpa_config_ops snet_config_ops = { static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) { - char name[50]; + char *name; int ret, i, mask = 0; /* We don't know which BAR will be used to communicate.. * We will map every bar with len > 0. @@ -573,7 +573,10 @@ static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) return -ENODEV; } - snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev)); + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-bars", pci_name(pdev)); + if (!name) + return -ENOMEM; + ret = pcim_iomap_regions(pdev, mask, name); if (ret) { SNET_ERR(pdev, "Failed to request and map PCI BARs\n"); @@ -590,10 +593,13 @@ static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) static int snet_open_vf_bar(struct pci_dev *pdev, struct snet *snet) { - char name[50]; + char *name; int ret; - snprintf(name, sizeof(name), "snet[%s]-bar", pci_name(pdev)); + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "snet[%s]-bars", pci_name(pdev)); + if (!name) + return -ENOMEM; + /* Request and map BAR */ ret = pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name); if (ret) {