linux-kernel - [PATCH] media: cx231xx: fix a memleak in cx231xx_init

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Message-Id: <20231201132256.3245268-1-alexious@zju.edu.cn>
Date:   Fri,  1 Dec 2023 21:22:55 +0800
From:   Zhipeng Lu <alexious@....edu.cn>
To:     alexious@....edu.cn
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Devin Heitmueller <dheitmueller@...ppauge.com>,
        Palash Bandyopadhyay <palash.bandyopadhyay@...exant.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: cx231xx: fix a memleak in cx231xx_init_isoc

The dma_q->p_left_data alloced by kzalloc should be freed in all the
following error handling paths. However, it hasn't been freed in the
allocation error paths of dev->video_mode.isoc_ctl.urb and
dev->video_mode.isoc_ctl.transfer_buffer.

On the other hand, the dma_q->p_left_data did be freed in the
error-handling paths after that of dev->video_mode.isoc_ctl.urb and
dev->video_mode.isoc_ctl.transfer_buffer, by calling
cx231xx_uninit_isoc(dev). So the same free operation should be done in
error-handling paths of those two allocation.

Fixes: 64fbf4445526 ("[media] cx231xx: Added support for Carraera, Shelby, RDx_253S and VIDEO_GRABBER")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
 drivers/media/usb/cx231xx/cx231xx-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/usb/cx231xx/cx231xx-core.c b/drivers/media/usb/cx231xx/cx231xx-core.c
index 727e6268567f..f1feccc28bf0 100644
--- a/drivers/media/usb/cx231xx/cx231xx-core.c
+++ b/drivers/media/usb/cx231xx/cx231xx-core.c
@@ -1024,6 +1024,7 @@ int cx231xx_init_isoc(struct cx231xx *dev, int max_packets,
 	if (!dev->video_mode.isoc_ctl.urb) {
 		dev_err(dev->dev,
 			"cannot alloc memory for usb buffers\n");
+		kfree(dma_q->p_left_data);
 		return -ENOMEM;
 	}
 
@@ -1033,6 +1034,7 @@ int cx231xx_init_isoc(struct cx231xx *dev, int max_packets,
 		dev_err(dev->dev,
 			"cannot allocate memory for usbtransfer\n");
 		kfree(dev->video_mode.isoc_ctl.urb);
+		kfree(dma_q->p_left_data);
 		return -ENOMEM;
 	}
 
-- 
2.34.1