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| author |   Li Qiang <liq3ea@gmail.com> | 2017-03-27 20:10:53 -0700 |
|---|---|---|
| committer |   Thomas Hellstrom <thellstrom@vmware.com> | 2017-03-30 11:46:26 +0200 |
| commit | e7e11f99564222d82f0ce84bd521e57d78a6b678 (patch) | |
| tree | f2a689ea74f34d155e1383869c82d453afe97619 /drivers/gpu/drm | |
| parent | drm/vmwgfx: Remove getparam error message (diff) | |
| download | linux-dev-e7e11f99564222d82f0ce84bd521e57d78a6b678.tar.xz linux-dev-e7e11f99564222d82f0ce84bd521e57d78a6b678.zip | |
drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
In vmw_surface_define_ioctl(), the 'num_sizes' is the sum of the
'req->mip_levels' array. This array can be assigned any value from
the user space. As both the 'num_sizes' and the array is uint32_t,
it is easy to make 'num_sizes' overflow. The later 'mip_levels' is
used as the loop count. This can lead an oob write. Add the check of
'req->mip_levels' to avoid this.
Cc: <stable@vger.kernel.org>
Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c index adc023fe67f3..05fa092c942b 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c @@ -713,8 +713,11 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data, 128; num_sizes = 0; - for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) + for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) { + if (req->mip_levels[i] > DRM_VMW_MAX_MIP_LEVELS) + return -EINVAL; num_sizes += req->mip_levels[i]; + } if (num_sizes > DRM_VMW_MAX_SURFACE_FACES * DRM_VMW_MAX_MIP_LEVELS || num_sizes == 0) |