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Filename Latest commit message Latest commit date
Anirudh Rayabharam 4a2933c883 net: hso: fix null-ptr-deref during tty device unregistration
commit 8a12f8836145ffe37e9c8733dce18c22fb668b66 upstream.

Multiple ttys try to claim the same the minor number causing a double
unregistration of the same device. The first unregistration succeeds
but the next one results in a null-ptr-deref.

The get_free_serial_index() function returns an available minor number
but doesn't assign it immediately. The assignment is done by the caller
later. But before this assignment, calls to get_free_serial_index()
would return the same minor number.

Fix this by modifying get_free_serial_index to assign the minor number
immediately after one is found to be and rename it to obtain_minor()
to better reflect what it does. Similary, rename set_serial_by_index()
to release_minor() and modify it to free up the minor number of the
given hso_serial. Every obtain_minor() should have corresponding
release_minor() call.

Fixes: 72dc1c096c ("HSO: add option hso driver")
Reported-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com
Tested-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-14 08:24:11 +02:00
arch ARM: dts: turris-omnia: configure LED[2]/INTn pin as interrupt pin 2021-04-14 08:24:11 +02:00
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drivers net: hso: fix null-ptr-deref during tty device unregistration 2021-04-14 08:24:11 +02:00
fs fs: direct-io: fix missing sdio->boundary 2021-04-14 08:24:11 +02:00
include
init init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM 2021-04-10 13:34:32 +02:00
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kernel gcov: re-fix clang-11+ support 2021-04-14 08:24:10 +02:00
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net batman-adv: initialize "struct batadv_tvlv_tt_vlan_data"->reserved field 2021-04-14 08:24:11 +02:00
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sound ASoC: intel: atom: Stop advertising non working S24LE support 2021-04-14 08:24:09 +02:00
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Makefile Linux 5.4.111 2021-04-10 13:34:32 +02:00
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.