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bbe70e4e42
In kernfs_path_from_node_locked(), there is an if statement on line 147
to check whether buf is NULL:
if (buf)
When buf is NULL, it is used on line 151:
len += strlcpy(buf + len, parent_str, ...)
and line 158:
len += strlcpy(buf + len, "/", ...)
and line 160:
len += strlcpy(buf + len, kn->name, ...)
Thus, possible null-pointer dereferences may occur.
To fix these possible bugs, buf is checked before being used.
If it is NULL, -EINVAL is returned.
These bugs are found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Link: https://lore.kernel.org/r/20190724022242.27505-1-baijiaju1990@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.