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commit3c4f8333b5upstream. In commit9b9c8195f3("tty: n_gsm: fix UAF in gsm_cleanup_mux"), the UAF problem is not completely fixed. There is a race condition in gsm_cleanup_mux(), which caused this UAF. The UAF problem is triggered by the following race: task[5046] task[5054] ----------------------- ----------------------- gsm_cleanup_mux(); dlci = gsm->dlci[0]; mutex_lock(&gsm->mutex); gsm_cleanup_mux(); dlci = gsm->dlci[0]; //Didn't take the lock gsm_dlci_release(gsm->dlci[i]); gsm->dlci[i] = NULL; mutex_unlock(&gsm->mutex); mutex_lock(&gsm->mutex); dlci->dead = true; //UAF Fix it by assigning values after mutex_lock(). Link: https://syzkaller.appspot.com/text?tag=CrashReport&x=176188b5a80000 Cc: stable <stable@kernel.org> Fixes:9b9c8195f3("tty: n_gsm: fix UAF in gsm_cleanup_mux") Fixes:aa371e96f0("tty: n_gsm: fix restart handling via CLD command") Signed-off-by: Yi Yang <yiyang13@huawei.com> Co-developed-by: Qiumiao Zhang <zhangqiumiao1@huawei.com> Signed-off-by: Qiumiao Zhang <zhangqiumiao1@huawei.com> Link: https://lore.kernel.org/r/20230811031121.153237-1-yiyang13@huawei.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.