linux-kernel - [PATCH] media: zr364xx: fix memory leak in zr364xx_start

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Message-Id: <20210517191814.1761-1-paskripkin@gmail.com>
Date:   Mon, 17 May 2021 22:18:14 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     royale@...ezo.com, mchehab@...nel.org, lamarque@...il.com
Cc:     linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>, stable@...r.kernel.org,
        syzbot+af4fa391ef18efdd5f69@...kaller.appspotmail.com
Subject: [PATCH] media: zr364xx: fix memory leak in zr364xx_start_readpipe

syzbot reported memory leak in zr364xx driver.
The problem was in non-freed urb in case of
usb_submit_urb() fail.

backtrace:
  [<ffffffff82baedf6>] kmalloc include/linux/slab.h:561 [inline]
  [<ffffffff82baedf6>] usb_alloc_urb+0x66/0xe0 drivers/usb/core/urb.c:74
  [<ffffffff82f7cce8>] zr364xx_start_readpipe+0x78/0x130 drivers/media/usb/zr364xx/zr364xx.c:1022
  [<ffffffff84251dfc>] zr364xx_board_init drivers/media/usb/zr364xx/zr364xx.c:1383 [inline]
  [<ffffffff84251dfc>] zr364xx_probe+0x6a3/0x851 drivers/media/usb/zr364xx/zr364xx.c:1516
  [<ffffffff82bb6507>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
  [<ffffffff826018a9>] really_probe+0x159/0x500 drivers/base/dd.c:576

Fixes: ccbf035ae5de ("V4L/DVB (12278): zr364xx: implement V4L2_CAP_STREAMING")
Cc: stable@...r.kernel.org
Reported-by: syzbot+af4fa391ef18efdd5f69@...kaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/media/usb/zr364xx/zr364xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/usb/zr364xx/zr364xx.c b/drivers/media/usb/zr364xx/zr364xx.c
index 1ef611e08323..538a330046ec 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -1032,6 +1032,7 @@ static int zr364xx_start_readpipe(struct zr364xx_camera *cam)
 	DBG("submitting URB %p\n", pipe_info->stream_urb);
 	retval = usb_submit_urb(pipe_info->stream_urb, GFP_KERNEL);
 	if (retval) {
+		usb_free_urb(pipe_info->stream_urb);
 		printk(KERN_ERR KBUILD_MODNAME ": start read pipe failed\n");
 		return retval;
 	}
-- 
2.31.1