media: venus: hfi: avoid null dereference in deinit

stable inclusion
from stable-v5.10.121
commit 27ad46da44177a78a4a0cae6fe03906888c61aa1
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=27ad46da44177a78a4a0cae6fe03906888c61aa1

--------------------------------

[ Upstream commit 86594f6a ]

If venus_probe fails at pm_runtime_put_sync the error handling first
calls hfi_destroy and afterwards hfi_core_deinit. As hfi_destroy sets
core->ops to NULL, hfi_core_deinit cannot call the core_deinit function
anymore.

Avoid this null pointer derefence by skipping the call when necessary.
Signed-off-by: NLuca Weiss <luca.weiss@fairphone.com>
Signed-off-by: NStanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/media/platform/qcom/venus/hfi.c

@@ -104,6 +104,9 @@ int hfi_core_deinit(struct venus_core *core, bool blocking)
 		mutex_lock(&core->lock);
 	}
 
+	if (!core->ops)
+		goto unlock;
+
 	ret = core->ops->core_deinit(core);
 
 	if (!ret)