86384a1fa3
commit 1dc2d785156cbdc80806c32e8d2c7c735d0b4721 upstream. h4_recv_buf() callers store the return value to socket buffer and recursively pass the buffer to h4_recv_buf() without protection. So, ERR_PTR returned from h4_recv_buf() can be dereferenced, if called again before setting the socket buffer to NULL from previous error. Check if skb is ERR_PTR in h4_recv_buf(). Reported-by: syzbot+017a32f149406df32703@syzkaller.appspotmail.com Signed-off-by: Myungho Jung <mhjungk@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.