linux-kernel - [PATCH AUTOSEL 4.14 10/29] media: venus: hfi: avoid null dereference in deinit

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Message-Id: <20220530135057.1937286-10-sashal@kernel.org>
Date:   Mon, 30 May 2022 09:50:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Luca Weiss <luca.weiss@...rphone.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sasha Levin <sashal@...nel.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 10/29] media: venus: hfi: avoid null dereference in deinit

From: Luca Weiss <luca.weiss@...rphone.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@...rphone.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 ba29fd4d4984..7d1d3e64007c 100644
--- a/drivers/media/platform/qcom/venus/hfi.c
+++ b/drivers/media/platform/qcom/venus/hfi.c
@@ -117,6 +117,9 @@ 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