CVE-2023-52989

In the Linux kernel, the following vulnerability has been resolved:

firewire: fix memory leak for payload of request subaction to IEC 61883-1 FCP region

This patch is fix for Linux kernel v2.6.33 or later.

For request subaction to IEC 61883-1 FCP region, Linux FireWire subsystem have had an issue of use-after-free. The subsystem allows multiple user space listeners to the region, while data of the payload was likely released before the listeners execute read(2) to access to it for copying to user space.

The issue was fixed by a commit 281e20323ab7 ("firewire: core: fix use-after-free regression in FCP handler"). The object of payload is duplicated in kernel space for each listener. When the listener executes ioctl(2) with FWCDEVIOCSENDRESPONSE request, the object is going to be released.

However, it causes memory leak since the commit relies on call of releaserequest() in drivers/firewire/core-cdev.c. Against the expectation, the function is never called due to the design of releaseclientresource(). The function delegates release task to caller when called with non-NULL fourth argument. The implementation of ioctlsend_response() is the case. It should release the object explicitly.

This commit fixes the bug.