diff options
| author | Michel Dänzer <michel@tungstengraphics.com> | 2007-02-18 10:03:21 +0300 |
|---|---|---|
| committer | Dave Airlie <airlied@linux.ie> | 2007-03-11 04:07:17 +0300 |
| commit | 80b2c386f3d8c3367533a8600b599f8686c9d386 (patch) | |
| tree | 348ad7e0937f79bf58821aa96afa46ed702bd8d7 /drivers/char/drm/radeon_cp.c | |
| parent | cd839d0048c3cb332cb0cd7d3de3431f8e1d3c7a (diff) | |
| download | linux-80b2c386f3d8c3367533a8600b599f8686c9d386.tar.xz | |
drm/radeon: Fix u32 overflows when determining AGP base address in card space.
The overflows could lead to the AGP aperture overlapping the framebuffer are in the card's address space when the latter is located at the very end of th 32 bit address space, which would result in a freeze on X server startup,
probably because the card read commands from the framebuffer instead of from AGP.
See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=392915 .
Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers/char/drm/radeon_cp.c')
| -rw-r--r-- | drivers/char/drm/radeon_cp.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/drm/radeon_cp.c b/drivers/char/drm/radeon_cp.c index 5ed965688293..c1850ecac302 100644 --- a/drivers/char/drm/radeon_cp.c +++ b/drivers/char/drm/radeon_cp.c @@ -1560,8 +1560,8 @@ static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init) if (dev_priv->flags & RADEON_IS_AGP) { base = dev->agp->base; /* Check if valid */ - if ((base + dev_priv->gart_size) > dev_priv->fb_location && - base < (dev_priv->fb_location + dev_priv->fb_size)) { + if ((base + dev_priv->gart_size - 1) >= dev_priv->fb_location && + base < (dev_priv->fb_location + dev_priv->fb_size - 1)) { DRM_INFO("Can't use AGP base @0x%08lx, won't fit\n", dev->agp->base); base = 0; @@ -1571,8 +1571,8 @@ static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init) /* If not or if AGP is at 0 (Macs), try to put it elsewhere */ if (base == 0) { base = dev_priv->fb_location + dev_priv->fb_size; - if (((base + dev_priv->gart_size) & 0xfffffffful) - < base) + if (base < dev_priv->fb_location || + ((base + dev_priv->gart_size) & 0xfffffffful) < base) base = dev_priv->fb_location - dev_priv->gart_size; } |