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drm: drm_ioctl() should zero-init extra data

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If an older userspace passes in a smaller arg than the current kernel
ioctl arg struct, then extra fields should be initialized to zero
rather than passing random data to the DRM driver.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Rob Clark
2011-09-18 14:38:15 -05:00
committed by Dave Airlie
parent 017ed8012e
commit dd2351da7c
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/drm_drv.c
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@@ -438,6 +438,8 @@ long drm_ioctl(struct file *filp,
goto err_i1; goto err_i1;
} }
} }
if (asize > usize)
memset(kdata + usize, 0, asize - usize);
} }
if (cmd & IOC_IN) { if (cmd & IOC_IN) {