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672c5715b6
commit 21c9fb611c25d5cd038f6fe485232e7884bb0b3d upstream. I ran into a randconfig build failure with UBSAN using gcc-13.2: arm-linux-gnueabi-ld: error: unplaced orphan section `.bss..Lubsan_data31' from `drivers/mtd/nand/raw/diskonchip.o' I'm not entirely sure what is going on here, but I suspect this has something to do with the check for the end of the doc_locations[] array that contains an (unsigned long)0xffffffff element, which is compared against the signed (int)0xffffffff. If this is the case, we should get a runtime check for undefined behavior, but we instead get an unexpected build-time error. I would have expected this to work fine on 32-bit architectures despite the signed integer overflow, though on 64-bit architectures this likely won't ever work. Changing the contition to instead check for the size of the array makes the code safe everywhere and avoids the ubsan check that leads to the link error. The loop code goes back to before 2.6.12. Cc: stable@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20240405143015.717429-1-arnd@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.