linux-kernel - [PATCH] s5p-jpeg: hangle error condition in s5p_jpeg

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Date:   Fri, 13 Nov 2020 19:06:25 +0300
From:   Baskov Evgeiny <baskov@...ras.ru>
To:     Andrzej Pietrasiewicz <andrzejtp2010@...il.com>
Cc:     Baskov Evgeiny <baskov@...ras.ru>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] s5p-jpeg: hangle error condition in s5p_jpeg_probe

If an error happens in jpeg_get_drv_data(), i.e. match fails,
jpeg->variant field is NULL, so we cannot access it.

Consider device probe failed if jpeg->variant is NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Baskov Evgeiny <baskov@...ras.ru>
---
 drivers/media/platform/s5p-jpeg/jpeg-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
index 9b22dd8e34f4..026111505f5a 100644
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
@@ -2862,6 +2862,8 @@ static int s5p_jpeg_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	jpeg->variant = jpeg_get_drv_data(&pdev->dev);
+	if (!jpeg->variant)
+		return -ENODEV;
 
 	mutex_init(&jpeg->lock);
 	spin_lock_init(&jpeg->slock);
-- 
2.29.2