[PATCH 5.4 026/411] media: venus: hfi: avoid null dereference in deinit

Greg Kroah-Hartman
2022-06-13T10:59:38Z

From: Luca Weiss <luca.weiss@fairphone.com>

[ Upstream commit 86594f6af867b5165d2ba7b5a71fae3a5961e56c ]

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: Luca Weiss <luca.weiss@fairphone.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/platform/qcom/venus/hfi.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/qcom/venus/hfi.c b/drivers/media/platform/qcom/venus/hfi.c
index 3d8b1284d1f3..68964a80fe61 100644
--- a/drivers/media/platform/qcom/venus/hfi.c
+++ b/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)
--
2.35.1