CVE-2024-26657: In the Linux kernel, the following vulnerability has been resolved:  drm/sched: fix null-ptr-deref in init entity  The bug can be triggered by sending an amdgpu_cs_wait_ioctl to the AMDGPU DRM driver on any ASICs with valid context. The bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>. For example the following code:      static void Syzkaller2(int fd)     {  union drm_amdgpu_ctx arg1;  union drm_amdgpu_wait_cs arg2;   arg1.in.op = AMDGPU_CTX_OP_ALLOC_CTX;  ret = drmIoctl(fd, 0x140106442 /* amdgpu_ctx_ioctl */, &arg1);   arg2.in.handle = 0x0;  arg2.in.timeout = 0x2000000000000;  arg2.in.ip_type = AMD_IP_VPE /* 0x9 */;  arg2->in.ip_instance = 0x0;  arg2.in.ring = 0x0;  arg2.in.ctx_id = arg1.out.alloc.ctx_id;   drmIoctl(fd, 0xc0206449 /* AMDGPU_WAIT_CS * /, &arg2);     }  The ioctl AMDGPU_WAIT_CS without previously submitted job could be assumed that the error should be returned, but the following commit 1decbf6bb0b4dc56c9da6c5e57b994ebfc2be3aa modified the logic and allowed to have sched_rq equal to NULL.  As a result when there is no job the ioctl AMDGPU_WAIT_CS returns success. The change fixes null-ptr-deref in init entity and the stack below demonstrates the error condition:  [  +0.000007] BUG: kernel NULL pointer dereference, address: 0000000000000028 [  +0.007086] #PF: supervisor read access in kernel mode [  +0.005234] #PF: error_code(0x0000) - not-present page [  +0.005232] PGD 0 P4D 0 [  +0.002501] Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI [  +0.005034] CPU: 10 PID: 9229 Comm: amd_basic Tainted: G    B   W    L     6.7.0+ #4 [  +0.007797] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020 [  +0.009798] RIP: 0010:drm_sched_entity_init+0x2d3/0x420 [gpu_sched] [  +0.006426] Code: 80 00 00 00 00 00 00 00 e8 1a 81 82 e0 49 89 9c 24 c0 00 00 00 4c 89 ef e8 4a 80 82 e0 49 8b 5d 00 48 8d 7b 28 e8 3d 80 82 e0 <48> 83 7b 28 00 0f 84 28 01 00 00 4d 8d ac 24 98 00 00 00 49 8d 5c [  +0.019094] RSP: 0018:ffffc90014c1fa40 EFLAGS: 00010282 [  +0.005237] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8113f3fa [  +0.007326] RDX: fffffbfff0a7889d RSI: 0000000000000008 RDI: ffffffff853c44e0 [  +0.007264] RBP: ffffc90014c1fa80 R08: 0000000000000001 R09: fffffbfff0a7889c [  +0.007266] R10: ffffffff853c44e7 R11: 0000000000000001 R12: ffff8881a719b010 [  +0.007263] R13: ffff88810d412748 R14: 0000000000000002 R15: 0000000000000000 [  +0.007264] FS:  00007ffff7045540(0000) GS:ffff8883cc900000(0000) knlGS:0000000000000000 [  +0.008236] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [  +0.005851] CR2: 0000000000000028 CR3: 000000011912e000 CR4: 0000000000350ef0 [  +0.007175] Call Trace: [  +0.002561]  <TASK> [  +0.002141]  ? show_regs+0x6a/0x80 [  +0.003473]  ? __die+0x25/0x70 [  +0.003124]  ? page_fault_oops+0x214/0x720 [  +0.004179]  ? preempt_count_sub+0x18/0xc0 [  +0.004093]  ? __pfx_page_fault_oops+0x10/0x10 [  +0.004590]  ? srso_return_thunk+0x5/0x5f [  +0.004000]  ? vprintk_default+0x1d/0x30 [  +0.004063]  ? srso_return_thunk+0x5/0x5f [  +0.004087]  ? vprintk+0x5c/0x90 [  +0.003296]  ? drm_sched_entity_init+0x2d3/0x420 [gpu_sched] [  +0.005807]  ? srso_return_thunk+0x5/0x5f [  +0.004090]  ? _printk+0xb3/0xe0 [  +0.003293]  ? __pfx__printk+0x10/0x10 [  +0.003735]  ? asm_sysvec_apic_timer_interrupt+0x1b/0x20 [  +0.005482]  ? do_user_addr_fault+0x345/0x770 [  +0.004361]  ? exc_page_fault+0x64/0xf0 [  +0.003972]  ? asm_exc_page_fault+0x27/0x30 [  +0.004271]  ? add_taint+0x2a/0xa0 [  +0.003476]  ? drm_sched_entity_init+0x2d3/0x420 [gpu_sched] [  +0.005812]  amdgpu_ctx_get_entity+0x3f9/0x770 [amdgpu] [  +0.009530]  ? finish_task_switch.isra.0+0x129/0x470 [  +0.005068]  ? __pfx_amdgpu_ctx_get_entity+0x10/0x10 [amdgpu] [  +0.010063]  ? __kasan_check_write+0x14/0x20 [  +0.004356]  ? srso_return_thunk+0x5/0x5f [  +0.004001]  ? mutex_unlock+0x81/0xd0 [  +0.003802]  ? srso_return_thunk+0x5/0x5f [  +0.004096]  amdgpu_cs_wait_ioctl+0xf6/0x270 [amdgpu] [  +0.009355]  ? __pfx_ ---truncated---