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commit 6989310f5d4327e8595664954edd40a7f99ddd0d upstream. Use offsetof to calculate offset of a field to take advantage of compiler built-in version when possible, and avoid UBSAN warning when compiling with Clang: ================================================================== UBSAN: Undefined behaviour in net/wireless/wext-core.c:525:14 member access within null pointer of type 'struct iw_point' CPU: 3 PID: 165 Comm: kworker/u16:3 Tainted: G S W 4.19.23 #43 Workqueue: cfg80211 __cfg80211_scan_done [cfg80211] Call trace: dump_backtrace+0x0/0x194 show_stack+0x20/0x2c __dump_stack+0x20/0x28 dump_stack+0x70/0x94 ubsan_epilogue+0x14/0x44 ubsan_type_mismatch_common+0xf4/0xfc __ubsan_handle_type_mismatch_v1+0x34/0x54 wireless_send_event+0x3cc/0x470 ___cfg80211_scan_done+0x13c/0x220 [cfg80211] __cfg80211_scan_done+0x28/0x34 [cfg80211] process_one_work+0x170/0x35c worker_thread+0x254/0x380 kthread+0x13c/0x158 ret_from_fork+0x10/0x18 =================================================================== Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20191204081307.138765-1-pihsun@chromium.org Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.