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path: root/drivers/gpu/drm/qxl/qxl_ioctl.c
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Diffstat (limited to 'drivers/gpu/drm/qxl/qxl_ioctl.c')
-rw-r--r--drivers/gpu/drm/qxl/qxl_ioctl.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c
index a4b71b25fa53..a30f29425c21 100644
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -171,6 +171,11 @@ static int qxl_execbuffer_ioctl(struct drm_device *dev, void *data,
if (user_cmd.command_size > PAGE_SIZE - sizeof(union qxl_release_info))
return -EINVAL;
+ if (!access_ok(VERIFY_READ,
+ (void *)(unsigned long)user_cmd.command,
+ user_cmd.command_size))
+ return -EFAULT;
+
ret = qxl_alloc_release_reserved(qdev,
sizeof(union qxl_release_info) +
user_cmd.command_size,