CVE-2023-53090

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

drm/amdkfd: Fix an illegal memory access

In the kfdwaitonevents() function, the kfdeventwaiter structure is allocated by alloceventwaiters(), but the event field of the waiter structure is not initialized; When copyfromuser() fails in the kfdwaitonevents() 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:nativequeuedspinlockslowpath+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: rawspinlockirqsave+0x30/0x40 localhost kernel: removewaitqueue+0x12/0x50 localhost kernel: kfdwaitonevents+0x1b6/0x490 [hydcu] localhost kernel: ? ftracegraphcaller+0xa0/0xa0 localhost kernel: kfdioctl+0x38c/0x4a0 [hydcu] localhost kernel: ? kfdioctlsettraphandler+0x70/0x70 [hydcu] localhost kernel: ? kfdioctlcreatequeue+0x5a0/0x5a0 [hydcu] localhost kernel: ? ftracegraph_caller+0xa0/0xa0 localhost kernel: __x64sysioctl+0x8e/0xd0 localhost kernel: ? syscalltraceenter.isra.18+0x143/0x1b0 localhost kernel: dosyscall64+0x33/0x80 localhost kernel: entrySYSCALL64afterhwframe+0x44/0xa9 localhost kernel: RIP: 0033:0x152a4dff68d7

Allocate the structure with kcalloc, and remove redundant 0-initialization and a redundant loop condition check.