linux-kernel - [PATCH] media: imx-jpeg: Fix possible null pointer dereference

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Date:   Mon, 27 Sep 2021 21:56:32 +0300
From:   Mirela Rabulea <mirela.rabulea@....com>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl,
        robert.chiras@....com, laurentiu.palcu@....com
Cc:     linux-imx@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: imx-jpeg: Fix possible null pointer dereference

Found by Coverity scan.

Signed-off-by: Mirela Rabulea <mirela.rabulea@....com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@....com>
---
 drivers/media/platform/imx-jpeg/mxc-jpeg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
index 2e1fef88cdf0..b1678f94dccd 100644
--- a/drivers/media/platform/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
@@ -576,6 +576,10 @@ static irqreturn_t mxc_jpeg_dec_irq(int irq, void *priv)
 
 	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
 	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+	if (!dst_buf || !src_buf) {
+		dev_err(dev, "No source or destination buffer.\n");
+		goto job_unlock;
+	}
 	jpeg_src_buf = vb2_to_mxc_buf(&src_buf->vb2_buf);
 
 	if (dec_ret & SLOT_STATUS_ENC_CONFIG_ERR) {
-- 
2.25.1