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Shipei Qu eaa95228b8 ALSA: usb-mixer: us16x08: validate meter packet indices [ Upstream commit `5526c1c6ba` ] get_meter_levels_from_urb() parses the 64-byte meter packets sent by the device and fills the per-channel arrays meter_level[], comp_level[] and master_level[] in struct snd_us16x08_meter_store. Currently the function derives the channel index directly from the meter packet (MUB2(meter_urb, s) - 1) and uses it to index those arrays without validating the range. If the packet contains a negative or out-of-range channel number, the driver may write past the end of these arrays. Introduce a local channel variable and validate it before updating the arrays. We reject negative indices, limit meter_level[] and comp_level[] to SND_US16X08_MAX_CHANNELS, and guard master_level[] updates with ARRAY_SIZE(master_level). Fixes: `d2bb390a20` ("ALSA: usb-audio: Tascam US-16x08 DSP mixer quirk") Reported-by: DARKNAVY (@DarkNavyOrg) <vr@darknavy.com> Closes: https://lore.kernel.org/tencent_21C112743C44C1A2517FF219@qq.com Signed-off-by: Shipei Qu <qu@darknavy.com> Link: https://patch.msgid.link/20251217024630.59576-1-qu@darknavy.com Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2026-01-02 12:56:58 +01:00
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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 reStructuredText 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.