CVE-2024-49942: In the Linux kernel, the following vulnerability has been resolved:  drm/xe: Prevent null pointer access in xe_migrate_copy  xe_migrate_copy designed to copy content of TTM resources. When source resource is null, it will trigger a NULL pointer dereference in xe_migrate_copy. To avoid this situation, update lacks source flag to true for this case, the flag will trigger xe_migrate_clear rather than xe_migrate_copy.  Issue trace: <7> [317.089847] xe 0000:00:02.0: [drm:xe_migrate_copy [xe]] Pass 14,  sizes: 4194304 & 4194304 <7> [317.089945] xe 0000:00:02.0: [drm:xe_migrate_copy [xe]] Pass 15,  sizes: 4194304 & 4194304 <1> [317.128055] BUG: kernel NULL pointer dereference, address:  0000000000000010 <1> [317.128064] #PF: supervisor read access in kernel mode <1> [317.128066] #PF: error_code(0x0000) - not-present page <6> [317.128069] PGD 0 P4D 0 <4> [317.128071] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI <4> [317.128074] CPU: 1 UID: 0 PID: 1440 Comm: kunit_try_catch Tainted:  G     U           N 6.11.0-rc7-xe #1 <4> [317.128078] Tainted: [U]=USER, [N]=TEST <4> [317.128080] Hardware name: Intel Corporation Lunar Lake Client  Platform/LNL-M LP5 RVP1, BIOS LNLMFWI1.R00.3221.D80.2407291239 07/29/2024 <4> [317.128082] RIP: 0010:xe_migrate_copy+0x66/0x13e0 [xe] <4> [317.128158] Code: 00 00 48 89 8d e0 fe ff ff 48 8b 40 10 4c 89 85 c8  fe ff ff 44 88 8d bd fe ff ff 65 48 8b 3c 25 28 00 00 00 48 89 7d d0 31  ff <8b> 79 10 48 89 85 a0 fe ff ff 48 8b 00 48 89 b5 d8 fe ff ff 83 ff <4> [317.128162] RSP: 0018:ffffc9000167f9f0 EFLAGS: 00010246 <4> [317.128164] RAX: ffff8881120d8028 RBX: ffff88814d070428 RCX:  0000000000000000 <4> [317.128166] RDX: ffff88813cb99c00 RSI: 0000000004000000 RDI:  0000000000000000 <4> [317.128168] RBP: ffffc9000167fbb8 R08: ffff88814e7b1f08 R09:  0000000000000001 <4> [317.128170] R10: 0000000000000001 R11: 0000000000000001 R12:  ffff88814e7b1f08 <4> [317.128172] R13: ffff88814e7b1f08 R14: ffff88813cb99c00 R15:  0000000000000001 <4> [317.128174] FS:  0000000000000000(0000) GS:ffff88846f280000(0000)  knlGS:0000000000000000 <4> [317.128176] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4> [317.128178] CR2: 0000000000000010 CR3: 000000011f676004 CR4:  0000000000770ef0 <4> [317.128180] DR0: 0000000000000000 DR1: 0000000000000000 DR2:  0000000000000000 <4> [317.128182] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:  0000000000000400 <4> [317.128184] PKRU: 55555554 <4> [317.128185] Call Trace: <4> [317.128187]  <TASK> <4> [317.128189]  ? show_regs+0x67/0x70 <4> [317.128194]  ? __die_body+0x20/0x70 <4> [317.128196]  ? __die+0x2b/0x40 <4> [317.128198]  ? page_fault_oops+0x15f/0x4e0 <4> [317.128203]  ? do_user_addr_fault+0x3fb/0x970 <4> [317.128205]  ? lock_acquire+0xc7/0x2e0 <4> [317.128209]  ? exc_page_fault+0x87/0x2b0 <4> [317.128212]  ? asm_exc_page_fault+0x27/0x30 <4> [317.128216]  ? xe_migrate_copy+0x66/0x13e0 [xe] <4> [317.128263]  ? __lock_acquire+0xb9d/0x26f0 <4> [317.128265]  ? __lock_acquire+0xb9d/0x26f0 <4> [317.128267]  ? sg_free_append_table+0x20/0x80 <4> [317.128271]  ? lock_acquire+0xc7/0x2e0 <4> [317.128273]  ? mark_held_locks+0x4d/0x80 <4> [317.128275]  ? trace_hardirqs_on+0x1e/0xd0 <4> [317.128278]  ? _raw_spin_unlock_irqrestore+0x31/0x60 <4> [317.128281]  ? __pm_runtime_resume+0x60/0xa0 <4> [317.128284]  xe_bo_move+0x682/0xc50 [xe] <4> [317.128315]  ? lock_is_held_type+0xaa/0x120 <4> [317.128318]  ttm_bo_handle_move_mem+0xe5/0x1a0 [ttm] <4> [317.128324]  ttm_bo_validate+0xd1/0x1a0 [ttm] <4> [317.128328]  shrink_test_run_device+0x721/0xc10 [xe] <4> [317.128360]  ? find_held_lock+0x31/0x90 <4> [317.128363]  ? lock_release+0xd1/0x2a0 <4> [317.128365]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10  [kunit] <4> [317.128370]  xe_bo_shrink_kunit+0x11/0x20 [xe] <4> [317.128397]  kunit_try_run_case+0x6e/0x150 [kunit] <4> [317.128400]  ? trace_hardirqs_on+0x1e/0xd0 <4> [317.128402]  ? _raw_spin_unlock_irqrestore+0x31/0x60 <4> [317.128404]  kunit_generic_run_threadfn_adapter+0x1e/0x40 [ku ---truncated---