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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Carl Yin <carl.yin@quectel.com>,
        Bhaumik Bhatt <bbhatt@codeaurora.org>,
        Hemant Kumar <hemantk@codeaurora.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 151/717] bus: mhi: core: Fix null pointer access when parsing MHI configuration
Date:   Mon, 28 Dec 2020 13:42:29 +0100
Message-Id: <20201228125028.200166670@linuxfoundation.org>
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References: <20201228125020.963311703@linuxfoundation.org>
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From: Carl Yin <carl.yin@quectel.com>

[ Upstream commit f4d0b39c842585c74bce8f8a80553369181b72df ]

Functions parse_ev_cfg() and parse_ch_cfg() access mhi_cntrl->mhi_dev
before it is set in function mhi_register_controller(),
use cntrl_dev instead of mhi_dev.

Fixes: 0cbf260820fa ("bus: mhi: core: Add support for registering MHI controllers")
Signed-off-by: Carl Yin <carl.yin@quectel.com>
Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/bus/mhi/core/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 0a09f8215057d..8cefa359fccd8 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -610,7 +610,7 @@ static int parse_ev_cfg(struct mhi_controller *mhi_cntrl,
 {
 	struct mhi_event *mhi_event;
 	const struct mhi_event_config *event_cfg;
-	struct device *dev = &mhi_cntrl->mhi_dev->dev;
+	struct device *dev = mhi_cntrl->cntrl_dev;
 	int i, num;
 
 	num = config->num_events;
@@ -692,7 +692,7 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
 			const struct mhi_controller_config *config)
 {
 	const struct mhi_channel_config *ch_cfg;
-	struct device *dev = &mhi_cntrl->mhi_dev->dev;
+	struct device *dev = mhi_cntrl->cntrl_dev;
 	int i;
 	u32 chan;
 
-- 
2.27.0