From nobody Tue Feb 10 02:59:37 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 E743A1CCEDE for ; Thu, 22 Aug 2024 13:48:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724334495; cv=none; b=W89a8zTTgCcomk0v1AqF1WUmIW7YsIiDIe/6eBpiZXXU8DMo9MbYPb5tcQ/LT43A+MJ9tB/J8iQPaNrt6+0nuIAOHFzt0AYd+62CYxv1TI2zn6buM5sUYsApwB/sqlKk6JdBoa+n13VbcTCqGyTWb1xizdcOK0km7ArTe9sJw9Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724334495; c=relaxed/simple; bh=KDo5b7D9c2aKWVtFHnbLLIbe9frXqS/ZEDy0EgIaE/w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ne6MCkW3DmRO2RG8J5KkPU17LeHaLHysphLbPRFKCO9DtG+ShBJ/N8wh52wlIrCK1wzEBQRtIWMMIiQyX0iY647ZF/wEwoKBqs7l1KthSy0w735WH8Y+gqcoWkHJ1+5viUwqOX8QOQGBMWtuwyPog4Hcf36jRp6fMded9B4Zlzw= 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=faJ76fCb; arc=none smtp.client-ip=170.10.133.124 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="faJ76fCb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1724334491; 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=KRyCGGbXeIqtIB2NKAJconNCn7y+8lt1LzEGsFrZVag=; b=faJ76fCbfD4cJACbOV400aiyG8OKm6IjdnqY+wDCptwX68YbTvmsHasmvcYTbizSj/bDWY pOp/so05ZtyuPZ2WpKXUa1KzuY5oDb84XH7hH3/OEOqWBgwjJaJRkROg3zqOj1fQcK0Ov9 WHlLcd/zR9CRolSupKBRp2gL9gckgsw= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-212-CFm2GB8ZOP2H2gc-iuIyLQ-1; Thu, 22 Aug 2024 09:48:10 -0400 X-MC-Unique: CFm2GB8ZOP2H2gc-iuIyLQ-1 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-42820af1106so6265095e9.2 for ; Thu, 22 Aug 2024 06:48:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724334489; x=1724939289; 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=KRyCGGbXeIqtIB2NKAJconNCn7y+8lt1LzEGsFrZVag=; b=lDQ08IlxJOiSsiw41e08+okuwqRg/eiBzUxOwfpFOF1ItmpZcGRJ6OaxTCjGDCvmtL cfL/uiMl762iHX2jZyn56VXAKwfkozwRPTXSRePb9FpV0FOlEoPF8kmeRlVsWut7HjfV hHIqbEQm+yDpVBAZQnqSlQJNXYy/C2s40jsjLx4q5H9oHlcROZSDdDtABlFzYIYjL6Ud U3kbfujJPQxnvUpZNf0VGovemCzmk35/dMeu5JZWrnoF7NoK6shNL9RLcmj1/G0d9Hi+ gaynxfQTtuZcnz4V+L7JvQ2ZIZjDIXB7KDLXnt1v/jzmXUiNx8V1j9H9DOyP6OsYXm5+ jMFw== X-Forwarded-Encrypted: i=1; AJvYcCVjzkS3PbXjwghHYK2Zv3tBKnLx+JGBdC5q0xOjGOLQpXkAYaDEpmm7zGPHHpXoz9ZSvNlFQziZTC4f8/E=@vger.kernel.org X-Gm-Message-State: AOJu0YzDjx5EXJdDfTaCFyF4BP1+5CLTP+NshXLuDtVJ+on9xcAQy4go 3Vh2L3/7JjZyfFWGYxSjXbKstIu5DuavwJs3vhXIbU6Fk1mptq+eFEHLRfL+KCjAgIDGpyW7/ct D6RYfWmd3/jnxQIoSggwJI45E3liDsY0EDSoe5plwl6D4DvgouQw1OsReDwn6tA== X-Received: by 2002:a05:600c:1f94:b0:426:6379:3b4f with SMTP id 5b1f17b1804b1-42ac564e9a2mr14095675e9.31.1724334489392; Thu, 22 Aug 2024 06:48:09 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEycROzO/HBKtY3F90/mam5y1MK/8INPkts2FEZk+sZD+ocdqE8maXCLum4hgY74c7bSFdk0Q== X-Received: by 2002:a05:600c:1f94:b0:426:6379:3b4f with SMTP id 5b1f17b1804b1-42ac564e9a2mr14095275e9.31.1724334488951; Thu, 22 Aug 2024 06:48:08 -0700 (PDT) Received: from eisenberg.muc.redhat.com (nat-pool-muc-t.redhat.com. [149.14.88.26]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42ac5162322sm25057215e9.24.2024.08.22.06.48.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Aug 2024 06:48:08 -0700 (PDT) From: Philipp Stanner To: Jonathan Corbet , Jens Axboe , Wu Hao , Tom Rix , Moritz Fischer , Xu Yilun , Andy Shevchenko , Linus Walleij , Bartosz Golaszewski , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexandre Torgue , Jose Abreu , Maxime Coquelin , Bjorn Helgaas , Alvaro Karsz , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Richard Cochran , Mark Brown , David Lechner , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Philipp Stanner , Damien Le Moal , Hannes Reinecke , Chaitanya Kulkarni Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fpga@vger.kernel.org, linux-gpio@vger.kernel.org, netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, virtualization@lists.linux.dev, stable@vger.kernel.org, Christophe JAILLET Subject: [PATCH v3 7/9] vdpa: solidrun: Fix UB bug with devres Date: Thu, 22 Aug 2024 15:47:39 +0200 Message-ID: <20240822134744.44919-8-pstanner@redhat.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240822134744.44919-1-pstanner@redhat.com> References: <20240822134744.44919-1-pstanner@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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@wa= nadoo.fr/ Suggested-by: Andy Shevchenko Signed-off-by: Philipp Stanner --- drivers/vdpa/solidrun/snet_main.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet= _main.c index 99428a04068d..67235f6190ef 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 =3D= { =20 static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) { - char name[50]; + char *name; int ret, i, mask =3D 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, str= uct psnet *psnet) return -ENODEV; } =20 - snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev)); + name =3D devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-bars", pci_nam= e(pdev)); + if (!name) + return -ENOMEM; + ret =3D pcim_iomap_regions(pdev, mask, name); if (ret) { SNET_ERR(pdev, "Failed to request and map PCI BARs\n"); @@ -590,10 +593,12 @@ static int psnet_open_pf_bar(struct pci_dev *pdev, st= ruct psnet *psnet) =20 static int snet_open_vf_bar(struct pci_dev *pdev, struct snet *snet) { - char name[50]; + char *name; int ret; =20 - snprintf(name, sizeof(name), "snet[%s]-bar", pci_name(pdev)); + name =3D devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-bars", pci_nam= e(pdev)); + if (!name) + return -ENOMEM; /* Request and map BAR */ ret =3D pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name); if (ret) { --=20 2.46.0