linux-kernel - [PATCH 4.9 033/117] bus/fsl_mc: Do not rely on caller to provide non NULL mc

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Message-Id: <20201109125027.221741848@linuxfoundation.org>
Date:   Mon,  9 Nov 2020 13:54:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Laurentiu Tudor <laurentiu.tudor@....com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 033/117] bus/fsl_mc: Do not rely on caller to provide non NULL mc_io

From: Diana Craciun <diana.craciun@....nxp.com>

[ Upstream commit 5026cf605143e764e1785bbf9158559d17f8d260 ]

Before destroying the mc_io, check first that it was
allocated.

Reviewed-by: Laurentiu Tudor <laurentiu.tudor@....com>
Acked-by: Laurentiu Tudor <laurentiu.tudor@....com>
Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
Link: https://lore.kernel.org/r/20200929085441.17448-11-diana.craciun@oss.nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/fsl-mc/bus/mc-io.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/fsl-mc/bus/mc-io.c b/drivers/staging/fsl-mc/bus/mc-io.c
index 798c965fe2033..3fa6774946fae 100644
--- a/drivers/staging/fsl-mc/bus/mc-io.c
+++ b/drivers/staging/fsl-mc/bus/mc-io.c
@@ -167,7 +167,12 @@ error_destroy_mc_io:
  */
 void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
 {
-	struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
+	struct fsl_mc_device *dpmcp_dev;
+
+	if (!mc_io)
+		return;
+
+	dpmcp_dev = mc_io->dpmcp_dev;
 
 	if (dpmcp_dev)
 		fsl_mc_io_unset_dpmcp(mc_io);
-- 
2.27.0