[PATCH 4.19 063/421] media: em28xx: Fix possible memory leak of em28xx struct

Greg Kroah-Hartman
2021-07-19T16:07:55Z

From: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>

[ Upstream commit ac5688637144644f06ed1f3c6d4dd8bb7db96020 ]

The em28xx struct kref isn't being decreased after an error in the
em28xx_ir_init, leading to a possible memory leak.

A kref_put and em28xx_shutdown_buttons is added to the error handler code.

Signed-off-by: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/usb/em28xx/em28xx-input.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/em28xx/em28xx-input.c b/drivers/media/usb/em28xx/em28xx-input.c
index f84a1208d5d3..3612f0d730dd 100644
--- a/drivers/media/usb/em28xx/em28xx-input.c
+++ b/drivers/media/usb/em28xx/em28xx-input.c
@@ -736,7 +736,8 @@ static int em28xx_ir_init(struct em28xx *dev)
dev->board.has_ir_i2c = 0;
dev_warn(&dev->intf->dev,
"No i2c IR remote control device found.\n");
- return -ENODEV;
+ err = -ENODEV;
+ goto ref_put;
}
}

@@ -751,7 +752,7 @@ static int em28xx_ir_init(struct em28xx *dev)

ir = kzalloc(sizeof(*ir), GFP_KERNEL);
if (!ir)
- return -ENOMEM;
+ goto ref_put;
rc = rc_allocate_device(RC_DRIVER_SCANCODE);
if (!rc)
goto error;
@@ -862,6 +863,9 @@ error:
dev->ir = NULL;
rc_free_device(rc);
kfree(ir);
+ref_put:
+ em28xx_shutdown_buttons(dev);
+ kref_put(&dev->ref, em28xx_free_device);
return err;
}

--
2.30.2