media: em28xx: fix memory leak in em28xx_init_dev

In the em28xx_init_rev, if em28xx_audio_setup fails, this function fails
to deallocate the media_dev allocated in the em28xx_media_device_init.

Fix this by adding em28xx_unregister_media_device to free media_dev.

BTW, this patch is tested in my local syzkaller instance, and it can
prevent the memory leak from occurring again.

CC: Pavel Skripkin <paskripkin@gmail.com>
Fixes: 37ecc7b1278f ("[media] em28xx: add media controller support")
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Reported-by: syzkaller <syzkaller@googlegroups.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c
index b207f34..b451ce3 100644 (file)
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -3630,8 +3630,10 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
 
        if (dev->is_audio_only) {
                retval = em28xx_audio_setup(dev);
-               if (retval)
-                       return -ENODEV;
+               if (retval) {
+                       retval = -ENODEV;
+                       goto err_deinit_media;
+               }
                em28xx_init_extension(dev);
 
                return 0;
@@ -3650,7 +3652,7 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
                dev_err(&dev->intf->dev,
                        "%s: em28xx_i2c_register bus 0 - error [%d]!\n",
                       __func__, retval);
-               return retval;
+               goto err_deinit_media;
        }
 
        /* register i2c bus 1 */
@@ -3666,9 +3668,7 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
                                "%s: em28xx_i2c_register bus 1 - error [%d]!\n",
                                __func__, retval);
 
-                       em28xx_i2c_unregister(dev, 0);
-
-                       return retval;
+                       goto err_unreg_i2c;
                }
        }
 
@@ -3676,6 +3676,12 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
        em28xx_card_setup(dev);
 
        return 0;
+
+err_unreg_i2c:
+       em28xx_i2c_unregister(dev, 0);
+err_deinit_media:
+       em28xx_unregister_media_device(dev);
+       return retval;
 }
 
 static int em28xx_duplicate_dev(struct em28xx *dev)