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commit 2d9463083ce92636a1bdd3e30d1236e3e95d859e upstream syzbot discovered a bug in which an OOB access was being made because an unsuitable key_idx value was wrongly considered to be acceptable while deleting a key in nl80211_del_key(). Since we don't know the cipher at the time of deletion, if cfg80211_validate_key_settings() were to be called directly in nl80211_del_key(), even valid keys would be wrongly determined invalid, and deletion wouldn't occur correctly. For this reason, a new function - cfg80211_valid_key_idx(), has been created, to determine if the key_idx value provided is valid or not. cfg80211_valid_key_idx() is directly called in 2 places - nl80211_del_key(), and cfg80211_validate_key_settings(). Reported-by: syzbot+49d4cab497c2142ee170@syzkaller.appspotmail.com Tested-by: syzbot+49d4cab497c2142ee170@syzkaller.appspotmail.com Suggested-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com> Link: https://lore.kernel.org/r/20201204215825.129879-1-anant.thazhemadam@gmail.com Cc: stable@vger.kernel.org [also disallow IGTK key IDs if no IGTK cipher is supported] Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Zubin Mithra <zsm@chromium.org> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.