1f035a5291
The following code in get_mext_match():
index = (index + items_num) % items_num;
... makes the program crash when items_num is zero (that is, the menu
is empty).
A menu can be empty when all the options in it are hidden by unmet
'depends on'.
For example,
menu "This menu will be empty"
config FOO
bool "foo"
depends on BROKEN
endmenu
If you visit this menu and press a '/' key and then another key, nconf
crashes with:
Floating point exception (core dumped)
When the number of items is zero, it does not make sense to search in
the menu. In this case, current_item() returns NULL, and item_index()
ERR, but get_mext_match() does not check it.
Let's make get_mext_match() just return if the menu is empty.
While I am here, change items_num from 'int' to 'unsigned int' because
it should never become negative.
Signed-off-by: Masahiro Yamada <masahiroy@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 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.