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Filename Latest commit message Latest commit date
Xiyu Yang 8f8d7f07d9 staging: comedi: Fix comedi_device refcnt leak in comedi_open 
commit 332e0e17ad49e084b7db670ef43b5eb59abd9e34 upstream.

comedi_open() invokes comedi_dev_get_from_minor(), which returns a
reference of the COMEDI device to "dev" with increased refcount.

When comedi_open() returns, "dev" becomes invalid, so the refcount
should be decreased to keep refcount balanced.

The reference counting issue happens in one exception handling path of
comedi_open(). When "cfp" allocation is failed, the refcnt increased by
comedi_dev_get_from_minor() is not decreased, causing a refcnt leak.

Fix this issue by calling comedi_dev_put() on this error path when "cfp"
allocation is failed.

Fixes: 20f083c075 ("staging: comedi: prepare support for per-file read and write subdevices")
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/1587361459-83622-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-29 16:33:20 +02:00
arch powerpc/setup_64: Set cache-line-size based on cache-block-size 2020-04-29 16:33:20 +02:00
block
certs
crypto
Documentation
drivers staging: comedi: Fix comedi_device refcnt leak in comedi_open 2020-04-29 16:33:20 +02:00
fs cifs: fix uninitialised lease_key in open_shroot() 2020-04-29 16:33:19 +02:00
include mac80211: populate debugfs only after cfg80211 init 2020-04-29 16:33:18 +02:00
init
ipc
kernel audit: check the length of userspace generated audit records 2020-04-29 16:33:18 +02:00
lib
LICENSES
mm
net SUNRPC: Fix backchannel RPC soft lockups 2020-04-29 16:33:18 +02:00
samples
scripts
security
sound ASoC: dapm: fixup dapm kcontrol widget 2020-04-29 16:33:18 +02:00
tools tools/vm: fix cross-compile build 2020-04-29 16:33:15 +02:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.