CVE-2024-56553

In the Linux kernel, the following vulnerability has been resolved: binder: fix memleak of proc->delivered_freeze If a freeze notification is cleared with BC_CLEAR_FREEZE_NOTIFICATION before calling binder_freeze_notification_done(), then it is detached from its reference (e.g. ref->freeze) but the work remains queued in proc->delivered_freeze. This leads to a memory leak when the process exits as any pending entries in proc->delivered_freeze are not freed: unreferenced object 0xffff38e8cfa36180 (size 64): comm "binder-util", pid 655, jiffies 4294936641 hex dump (first 32 bytes): b8 e9 9e c8 e8 38 ff ff b8 e9 9e c8 e8 38 ff ff .....8.......8.. 0b 00 00 00 00 00 00 00 3c 1f 4b 00 00 00 00 00 ........ ] kmemleak_alloc+0x34/0x40 [ ] __kmalloc_cache_noprof+0x208/0x280 [ ] binder_thread_write+0xdec/0x439c [ ] binder_ioctl+0x1b68/0x22cc [ ] __arm64_sys_ioctl+0x124/0x190 [ ] invoke_syscall+0x6c/0x254 [ ] el0_svc_common.constprop.0+0xac/0x230 [ ] do_el0_svc+0x40/0x58 [ ] el0_svc+0x38/0x78 [ ] el0t_64_sync_handler+0x120/0x12c [ ] el0t_64_sync+0x190/0x194 This patch fixes the leak by ensuring that any pending entries in proc->delivered_freeze are freed during binder_deferred_release().