Lv Yunlong 7a1cd9044d gpu/xen: Fix a use after free in xen_drm_drv_init ... [ Upstream commit 52762efa2b256ed1c5274e5177cbd52ee11a2f6a ] 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 Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-04-21 13:00:52 +02:00
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Kconfig
Makefile
xen_drm_front_cfg.c
xen_drm_front_cfg.h
xen_drm_front_conn.c
xen_drm_front_conn.h
xen_drm_front_evtchnl.c
xen_drm_front_evtchnl.h
xen_drm_front_gem.c
xen_drm_front_gem.h
xen_drm_front_kms.c
xen_drm_front_kms.h
xen_drm_front.c
xen_drm_front.h