drm/gma500: Fix out-of-bounds access to struct drm_device.vblank[]

commit 06ad8d339524bf94b89859047822c31df6ace239 upstream.

The gma500 driver expects 3 pipelines in several it's IRQ functions.
Accessing struct drm_device.vblank[], this fails with devices that only
have 2 pipelines. An example KASAN report is shown below.

  [   62.267688] ==================================================================
  [   62.268856] BUG: KASAN: slab-out-of-bounds in psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.269450] Read of size 1 at addr ffff8880012bc6d0 by task systemd-udevd/285
  [   62.269949]
  [   62.270192] CPU: 0 PID: 285 Comm: systemd-udevd Tainted: G            E     5.10.0-rc1-1-default+ #572
  [   62.270807] Hardware name:  /DN2800MT, BIOS MTCDT10N.86A.0164.2012.1213.1024 12/13/2012
  [   62.271366] Call Trace:
  [   62.271705]  dump_stack+0xae/0xe5
  [   62.272180]  print_address_description.constprop.0+0x17/0xf0
  [   62.272987]  ? psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.273474]  __kasan_report.cold+0x20/0x38
  [   62.273989]  ? psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.274460]  kasan_report+0x3a/0x50
  [   62.274891]  psb_irq_postinstall+0x250/0x3c0 [gma500_gfx]
  [   62.275380]  drm_irq_install+0x131/0x1f0
  <...>
  [   62.300751] Allocated by task 285:
  [   62.301223]  kasan_save_stack+0x1b/0x40
  [   62.301731]  __kasan_kmalloc.constprop.0+0xbf/0xd0
  [   62.302293]  drmm_kmalloc+0x55/0x100
  [   62.302773]  drm_vblank_init+0x77/0x210

Resolve the issue by only handling vblank entries up to the number of
CRTCs.

I'm adding a Fixes tag for reference, although the bug has been present
since the driver's initial commit.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Fixes: 5c49fd3aa0ab ("gma500: Add the core DRM files and headers")
Cc: Alan Cox <alan@linux.intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: dri-devel@lists.freedesktop.org
Cc: stable@vger.kernel.org#v3.3+
Link: https://patchwork.freedesktop.org/patch/msgid/20201105190256.3893-1-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/gma500/psb_irq.c b/drivers/gpu/drm/gma500/psb_irq.c
index 78eb10902809139145ad6b2dab3d690ee5eb2b52..076b6da44f461749dc2618fe68c12c0f669a4355 100644 (file)
--- a/drivers/gpu/drm/gma500/psb_irq.c
+++ b/drivers/gpu/drm/gma500/psb_irq.c
@@ -350,6 +350,7 @@ int psb_irq_postinstall(struct drm_device *dev)
 {
        struct drm_psb_private *dev_priv = dev->dev_private;
        unsigned long irqflags;
+       unsigned int i;
 
        spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 
@@ -362,20 +363,12 @@ int psb_irq_postinstall(struct drm_device *dev)
        PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
        PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM);
 
-       if (dev->vblank[0].enabled)
-               psb_enable_pipestat(dev_priv, 0, PIPE_VBLANK_INTERRUPT_ENABLE);
-       else
-               psb_disable_pipestat(dev_priv, 0, PIPE_VBLANK_INTERRUPT_ENABLE);
-
-       if (dev->vblank[1].enabled)
-               psb_enable_pipestat(dev_priv, 1, PIPE_VBLANK_INTERRUPT_ENABLE);
-       else
-               psb_disable_pipestat(dev_priv, 1, PIPE_VBLANK_INTERRUPT_ENABLE);
-
-       if (dev->vblank[2].enabled)
-               psb_enable_pipestat(dev_priv, 2, PIPE_VBLANK_INTERRUPT_ENABLE);
-       else
-               psb_disable_pipestat(dev_priv, 2, PIPE_VBLANK_INTERRUPT_ENABLE);
+       for (i = 0; i < dev->num_crtcs; ++i) {
+               if (dev->vblank[i].enabled)
+                       psb_enable_pipestat(dev_priv, i, PIPE_VBLANK_INTERRUPT_ENABLE);
+               else
+                       psb_disable_pipestat(dev_priv, i, PIPE_VBLANK_INTERRUPT_ENABLE);
+       }
 
        if (dev_priv->ops->hotplug_enable)
                dev_priv->ops->hotplug_enable(dev, true);
@@ -388,6 +381,7 @@ void psb_irq_uninstall(struct drm_device *dev)
 {
        struct drm_psb_private *dev_priv = dev->dev_private;
        unsigned long irqflags;
+       unsigned int i;
 
        spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
 
@@ -396,14 +390,10 @@ void psb_irq_uninstall(struct drm_device *dev)
 
        PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM);
 
-       if (dev->vblank[0].enabled)
-               psb_disable_pipestat(dev_priv, 0, PIPE_VBLANK_INTERRUPT_ENABLE);
-
-       if (dev->vblank[1].enabled)
-               psb_disable_pipestat(dev_priv, 1, PIPE_VBLANK_INTERRUPT_ENABLE);
-
-       if (dev->vblank[2].enabled)
-               psb_disable_pipestat(dev_priv, 2, PIPE_VBLANK_INTERRUPT_ENABLE);
+       for (i = 0; i < dev->num_crtcs; ++i) {
+               if (dev->vblank[i].enabled)
+                       psb_disable_pipestat(dev_priv, i, PIPE_VBLANK_INTERRUPT_ENABLE);
+       }
 
        dev_priv->vdc_irq_mask &= _PSB_IRQ_SGX_FLAG |
                                  _PSB_IRQ_MSVDX_FLAG |