linux-kernel - [PATCH 2/6] intel_th: msu-sink: Potential dereference of null pointer

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Message-Id: <20220705082637.59979-3-alexander.shishkin@linux.intel.com>
Date:   Tue,  5 Jul 2022 11:26:33 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH 2/6] intel_th: msu-sink: Potential dereference of null pointer

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

The return value of dma_alloc_coherent() needs to be checked.
To avoid use of null pointer in sg_set_buf() in case of the failure of
alloc.

Fixes: f220df66f676 ("intel_th: msu-sink: An example msu buffer "sink"")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/hwtracing/intel_th/msu-sink.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hwtracing/intel_th/msu-sink.c b/drivers/hwtracing/intel_th/msu-sink.c
index 2c7f5116be12..891b28ea25fe 100644
--- a/drivers/hwtracing/intel_th/msu-sink.c
+++ b/drivers/hwtracing/intel_th/msu-sink.c
@@ -71,6 +71,9 @@ static int msu_sink_alloc_window(void *data, struct sg_table **sgt, size_t size)
 		block = dma_alloc_coherent(priv->dev->parent->parent,
 					   PAGE_SIZE, &sg_dma_address(sg_ptr),
 					   GFP_KERNEL);
+		if (!block)
+			return -ENOMEM;
+
 		sg_set_buf(sg_ptr, block, PAGE_SIZE);
 	}
 
-- 
2.35.1