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gpu/xen: Fix a use after free in xen_drm_drv_init

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In function displback_changed, has the call chain
displback_connect(front_info)->xen_drm_drv_init(front_info).
We can see that drm_info is assigned to front_info->drm_info
and drm_info is freed in fail branch in xen_drm_drv_init().

Later displback_disconnect(front_info) is called and it calls
xen_drm_drv_fini(front_info) cause a use after free by
drm_info = front_info->drm_info statement.

My patch has done two things. First fixes the fail label which
drm_info = kzalloc() failed and still free the drm_info.
Second sets front_info->drm_info to NULL to avoid uaf.

Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210323014656.10068-1-lyl2019@mail.ustc.edu.cn
This commit is contained in:
Lv Yunlong 2021-03-22 18:46:56 -07:00 committed by Oleksandr Andrushchenko
parent 50891bead8
commit 52762efa2b
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/xen/xen_drm_front.c
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@ -521,7 +521,7 @@ static int xen_drm_drv_init(struct xen_drm_front_info *front_info)
drm_dev = drm_dev_alloc(&xen_drm_driver, dev);
if (IS_ERR(drm_dev)) {
ret = PTR_ERR(drm_dev);
goto fail;
goto fail_dev;
}
drm_info->drm_dev = drm_dev;
@ -551,8 +551,10 @@ fail_modeset:
drm_kms_helper_poll_fini(drm_dev);
drm_mode_config_cleanup(drm_dev);
drm_dev_put(drm_dev);
fail:
fail_dev:
kfree(drm_info);
front_info->drm_info = NULL;
fail:
return ret;
}