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29c063658d
Currently, exfat utf8 mount option depends on the iocharset option value. After exfat remount, utf8 option may become inconsistent with iocharset option. If the options are inconsistent; (specifically, iocharset=utf8 but utf8=0) readdir may reference uninitalized NLS, leading to a null pointer dereference. Extract and combine utf8/iocharset setup logic into exfat_set_iocharset(). Then Replace iocharset setup logic to exfat_set_iocharset to prevent utf8/iocharset option inconsistentcy after remount. Reported-by: syzbot+3e9cb93e3c5f90d28e19@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3e9cb93e3c5f90d28e19 Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com> Fixes: acab02ffcd6b ("exfat: support modifying mount options via remount") Tested-by: syzbot+3e9cb93e3c5f90d28e19@syzkaller.appspotmail.com Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
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 reStructuredText 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.