CVE-2023-53090

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

drm/amdkfd: Fix an illegal memory access

In the kfd_wait_on_events() function, the kfd_event_waiter structure is

allocated by alloc_event_waiters(), but the event field of the waiter

structure is not initialized; When copy_from_user() fails in the

kfd_wait_on_events() function, it will enter exception handling to

release the previously allocated memory of the waiter structure;

Due to the event field of the waiters structure being accessed

in the free_waiters() function, this results in illegal memory access

and system crash, here is the crash log:

localhost kernel: RIP: 0010:native_queued_spin_lock_slowpath+0x185/0x1e0

localhost kernel: RSP: 0018:ffffaa53c362bd60 EFLAGS: 00010082

localhost kernel: RAX: ff3d3d6bff4007cb RBX: 0000000000000282 RCX: 00000000002c0000

localhost kernel: RDX: ffff9e855eeacb80 RSI: 000000000000279c RDI: ffffe7088f6a21d0

localhost kernel: RBP: ffffe7088f6a21d0 R08: 00000000002c0000 R09: ffffaa53c362be64

localhost kernel: R10: ffffaa53c362bbd8 R11: 0000000000000001 R12: 0000000000000002

localhost kernel: R13: ffff9e7ead15d600 R14: 0000000000000000 R15: ffff9e7ead15d698

localhost kernel: FS: 0000152a3d111700(0000) GS:ffff9e855ee80000(0000) knlGS:0000000000000000

localhost kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

localhost kernel: CR2: 0000152938000010 CR3: 000000044d7a4000 CR4: 00000000003506e0

localhost kernel: Call Trace:

localhost kernel: _raw_spin_lock_irqsave+0x30/0x40

localhost kernel: remove_wait_queue+0x12/0x50

localhost kernel: kfd_wait_on_events+0x1b6/0x490 [hydcu]

localhost kernel: ? ftrace_graph_caller+0xa0/0xa0

localhost kernel: kfd_ioctl+0x38c/0x4a0 [hydcu]

localhost kernel: ? kfd_ioctl_set_trap_handler+0x70/0x70 [hydcu]

localhost kernel: ? kfd_ioctl_create_queue+0x5a0/0x5a0 [hydcu]

localhost kernel: ? ftrace_graph_caller+0xa0/0xa0

localhost kernel: __x64_sys_ioctl+0x8e/0xd0

localhost kernel: ? syscall_trace_enter.isra.18+0x143/0x1b0

localhost kernel: do_syscall_64+0x33/0x80

localhost kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9

localhost kernel: RIP: 0033:0x152a4dff68d7

Allocate the structure with kcalloc, and remove redundant 0-initialization

and a redundant loop condition check.