linux-kernel - [PATCH 10/10] drm/vboxvideo: fix mapping leaks

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Date: Mon, 15 Jan 2024 15:46:21 +0100
From: Philipp Stanner <pstanner@...hat.com>
To: Jonathan Corbet <corbet@....net>,
	Hans de Goede <hdegoede@...hat.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Philipp Stanner <pstanner@...hat.com>,
	Sam Ravnborg <sam@...nborg.org>,
	dakr@...hat.com
Cc: linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-pci@...r.kernel.org,
	stable@...nel.vger.org
Subject: [PATCH 10/10] drm/vboxvideo: fix mapping leaks

When the managed PCI-API was introduced to this driver, it was falsly
assumed that initializing the device with pcim_enable_device() instead
of pci_enable_device() will make all PCI functions managed.

This is wrong and was caused by the quite confusing devres API for PCI:
The function pci_iomap_range() is never managed.

Replace pci_iomap_range() with the actually managed function
pcim_iomap_range().

Additionally, add a call to pcim_request_region() to ensure exclusive
access to BAR 0.

CC: <stable@...nel.vger.org> # v5.10+
Fixes: 8558de401b5f ("drm/vboxvideo: use managed pci functions")
Signed-off-by: Philipp Stanner <pstanner@...hat.com>
---
 drivers/gpu/drm/vboxvideo/vbox_main.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/vboxvideo/vbox_main.c b/drivers/gpu/drm/vboxvideo/vbox_main.c
index 42c2d8a99509..7f686a0190e6 100644
--- a/drivers/gpu/drm/vboxvideo/vbox_main.c
+++ b/drivers/gpu/drm/vboxvideo/vbox_main.c
@@ -42,12 +42,11 @@ static int vbox_accel_init(struct vbox_private *vbox)
 	/* Take a command buffer for each screen from the end of usable VRAM. */
 	vbox->available_vram_size -= vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE;
 
-	vbox->vbva_buffers = pci_iomap_range(pdev, 0,
-					     vbox->available_vram_size,
-					     vbox->num_crtcs *
-					     VBVA_MIN_BUFFER_SIZE);
-	if (!vbox->vbva_buffers)
-		return -ENOMEM;
+	vbox->vbva_buffers = pcim_iomap_range(
+			pdev, 0, vbox->available_vram_size,
+			vbox->num_crtcs * VBVA_MIN_BUFFER_SIZE);
+	if (IS_ERR(vbox->vbva_buffers))
+		return PTR_ERR(vbox->vbva_buffers);
 
 	for (i = 0; i < vbox->num_crtcs; ++i) {
 		vbva_setup_buffer_context(&vbox->vbva_info[i],
@@ -115,12 +114,15 @@ int vbox_hw_init(struct vbox_private *vbox)
 
 	DRM_INFO("VRAM %08x\n", vbox->full_vram_size);
 
+	ret = pcim_request_region(pdev, 0, "vboxvideo");
+	if (ret)
+		return ret;
+
 	/* Map guest-heap at end of vram */
-	vbox->guest_heap =
-	    pci_iomap_range(pdev, 0, GUEST_HEAP_OFFSET(vbox),
-			    GUEST_HEAP_SIZE);
-	if (!vbox->guest_heap)
-		return -ENOMEM;
+	vbox->guest_heap = pcim_iomap_range(pdev, 0,
+			GUEST_HEAP_OFFSET(vbox), GUEST_HEAP_SIZE);
+	if (IS_ERR(vbox->guest_heap))
+		return PTR_ERR(vbox->guest_heap);
 
 	/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
 	vbox->guest_pool = devm_gen_pool_create(vbox->ddev.dev, 4, -1,
-- 
2.43.0