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Seungjin Bae e2f3ea15e8 wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb() [ Upstream commit `b647d2574e` ] The rtl8187_rx_cb() calculates the rx descriptor header address by subtracting its size from the skb tail pointer. However, it does not validate if the received packet (skb->len from urb->actual_length) is large enough to contain this header. If a truncated packet is received, this will lead to a buffer underflow, reading memory before the start of the skb data area, and causing a kernel panic. Add length checks for both rtl8187 and rtl8187b descriptor headers before attempting to access them, dropping the packet cleanly if the check fails. Fixes: `6f7853f3cb` ("rtl8187: change rtl8187_dev.c to support RTL8187B (part 2)") Signed-off-by: Seungjin Bae <eeodqql09@gmail.com> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Link: https://patch.msgid.link/20251118013258.1789949-2-eeodqql09@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2026-01-11 15:18:28 +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 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.