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commitcf6531d981upstream. smb2_tree_disconnect() freed the struct ksmbd_tree_connect, but it left the dangling pointer. It can be accessed again under compound requests. This bug can lead an oops looking something link: [ 1685.468014 ] BUG: KASAN: use-after-free in ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468068 ] Read of size 4 at addr ffff888102172180 by task kworker/1:2/4807 ... [ 1685.468130 ] Call Trace: [ 1685.468132 ] <TASK> [ 1685.468135 ] dump_stack_lvl+0x49/0x5f [ 1685.468141 ] print_report.cold+0x5e/0x5cf [ 1685.468145 ] ? ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468157 ] kasan_report+0xaa/0x120 [ 1685.468194 ] ? ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468206 ] __asan_report_load4_noabort+0x14/0x20 [ 1685.468210 ] ksmbd_tree_conn_disconnect+0x131/0x160 [ksmbd] [ 1685.468222 ] smb2_tree_disconnect+0x175/0x250 [ksmbd] [ 1685.468235 ] handle_ksmbd_work+0x30e/0x1020 [ksmbd] [ 1685.468247 ] process_one_work+0x778/0x11c0 [ 1685.468251 ] ? _raw_spin_lock_irq+0x8e/0xe0 [ 1685.468289 ] worker_thread+0x544/0x1180 [ 1685.468293 ] ? __cpuidle_text_end+0x4/0x4 [ 1685.468297 ] kthread+0x282/0x320 [ 1685.468301 ] ? process_one_work+0x11c0/0x11c0 [ 1685.468305 ] ? kthread_complete_and_exit+0x30/0x30 [ 1685.468309 ] ret_from_fork+0x1f/0x30 Fixes:e2f34481b2("cifsd: add server-side procedures for SMB3") Cc: stable@vger.kernel.org Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-17816 Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com> Signed-off-by: Steve French <stfrench@microsoft.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.