Georgiy Osokin a02d5d7ad7 HID: picolcd: prevent NULL pointer dereference in picolcd_send_and_wait()
[ Upstream commit 0021eb0904 ]

In picolcd_send_and_wait(), an integer overflow of the signed loop counter
'k' can theoretically lead to a NULL pointer dereference of 'raw_data'.
If the loop executes more than INT_MAX times, 'k' becomes negative,
making the condition 'k < size' true even when 'size' is 0.

Change the type of 'k' to 'unsigned int' to prevent the overflow and
eliminate the out-of-bounds access.

Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.

[jkosina@suse.com: extended hash length]
Fixes: fabdbf2fd2 ("HID: picoLCD: split driver code")
Signed-off-by: Georgiy Osokin <g.osokin@auroraos.dev>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2026-07-24 16:03:26 +02:00
2026-07-24 16:03:06 +02:00
2026-05-23 13:03:09 +02:00
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2026-05-23 13:03:09 +02:00
2026-07-04 13:42:28 +02:00
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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.
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