From: Yang Yingliang yangyingliang@huawei.com

stable inclusion from stable-v4.19.211 commit 1508b09945bde393326a9dab73b1fc35f672d771 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4NL CVE: CVE-2021-47423

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit f5a8703a9c418c6fc54eb772712dfe7641e3991c ]

When using single_open() for opening, single_release() should be called, otherwise the 'op' allocated in single_open() will be leaked.

Fixes: 6e9fc177399f ("drm/nouveau/debugfs: add copy of sysfs pstate interface ported to debugfs") Reported-by: Hulk Robot hulkci@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com Reviewed-by: Karol Herbst kherbst@redhat.com Signed-off-by: Karol Herbst kherbst@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20210911075023.3969054-2-yangy... Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zucheng zhengzucheng@huawei.com --- drivers/gpu/drm/nouveau/nouveau_debugfs.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c index 9635704a1d86..41f9c53302ab 100644 --- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c +++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c @@ -182,6 +182,7 @@ static const struct file_operations nouveau_pstate_fops = { .open = nouveau_debugfs_pstate_open, .read = seq_read, .write = nouveau_debugfs_pstate_set, + .release = single_release, };

static struct drm_info_list nouveau_debugfs_list[] = {