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From: Vladis Dronov <vdronov@redhat.com>
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Subject: [PATCH] drm/vmwgfx: Check check that number of mip levels is above zero in vmw_surface_define_ioctl()
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Date: 2017-03-24 15:37:10
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In vmw_surface_define_ioctl(), a num_sizes parameter is assigned a
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user-controlled value which is not checked for zero. It is used in
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a call to kmalloc() which returns ZERO_SIZE_PTR. Later ZERO_SIZE_PTR
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is dereferenced which leads to a GPF and possibly to a kernel panic.
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Add the check for zero to avoid this.
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Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1435719
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Signed-off-by: Vladis Dronov <vdronov@redhat.com>
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---
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drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
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index b445ce9..42840cc 100644
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--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
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+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
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@@ -716,8 +716,8 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
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for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
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num_sizes += req->mip_levels[i];
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- if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
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- DRM_VMW_MAX_MIP_LEVELS)
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+ if (num_sizes <= 0 ||
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+ num_sizes > DRM_VMW_MAX_SURFACE_FACES * DRM_VMW_MAX_MIP_LEVELS)
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return -EINVAL;
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size = vmw_user_surface_size + 128 +
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--
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2.9.3
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