CVE-2024-38602

In the Linux kernel, the following vulnerability has been resolved: ax25:
Fix reference count leak issues of ax25_dev The ax25_addr_ax25dev() and
ax25_dev_device_down() exist a reference count leak issue of the object
“ax25_dev”. Memory leak issue in ax25_addr_ax25dev(): The reference count
of the object “ax25_dev” can be increased multiple times in
ax25_addr_ax25dev(). This will cause a memory leak. Memory leak issues in
ax25_dev_device_down(): The reference count of ax25_dev is set to 1 in
ax25_dev_device_up() and then increase the reference count when ax25_dev is
added to ax25_dev_list. As a result, the reference count of ax25_dev is 2.
But when the device is shutting down. The ax25_dev_device_down() drops the
reference count once or twice depending on if we goto unlock_put or not,
which will cause memory leak. As for the issue of ax25_addr_ax25dev(), it
is impossible for one pointer to be on a list twice. So add a break in
ax25_addr_ax25dev(). As for the issue of ax25_dev_device_down(), increase
the reference count of ax25_dev once in ax25_dev_device_up() and decrease
the reference count of ax25_dev after it is removed from the ax25_dev_list.