================================================================== BUG: KASAN: slab-use-after-free in iopt_unmap_iova_range+0x5ba/0x5f0 drivers/iommu/iommufd/io_pagetable.c:499 Read of size 4 at addr ffff88807bcd1784 by task syz-executor409/5063 CPU: 0 PID: 5063 Comm: syz-executor409 Not tainted 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 iopt_unmap_iova_range+0x5ba/0x5f0 drivers/iommu/iommufd/io_pagetable.c:499 iopt_unmap_all+0x27/0x50 drivers/iommu/iommufd/io_pagetable.c:555 iommufd_ioas_unmap+0x3d0/0x490 drivers/iommu/iommufd/ioas.c:300 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f60f5126bc9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f60f50d8308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f60f51ae428 RCX: 00007f60f5126bc9 RDX: 00000000200001c0 RSI: 0000000000003b86 RDI: 0000000000000003 RBP: 00007f60f51ae420 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f60f51ae42c R13: 00007f60f517c064 R14: 6d6f692f7665642f R15: 0000000000022000 Allocated by task 5063: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] iopt_alloc_area_pages+0x94/0x560 drivers/iommu/iommufd/io_pagetable.c:234 iopt_map_pages drivers/iommu/iommufd/io_pagetable.c:339 [inline] iopt_map_user_pages+0x205/0x4e0 drivers/iommu/iommufd/io_pagetable.c:404 iommufd_ioas_map+0x329/0x5f0 drivers/iommu/iommufd/ioas.c:222 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5064: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] __cache_free mm/slab.c:3389 [inline] __do_kmem_cache_free mm/slab.c:3576 [inline] __kmem_cache_free+0xcd/0x2c0 mm/slab.c:3583 iopt_abort_area drivers/iommu/iommufd/io_pagetable.c:292 [inline] iopt_unmap_iova_range+0x288/0x5f0 drivers/iommu/iommufd/io_pagetable.c:509 iopt_unmap_all+0x27/0x50 drivers/iommu/iommufd/io_pagetable.c:555 iommufd_ioas_unmap+0x3d0/0x490 drivers/iommu/iommufd/ioas.c:300 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807bcd1700 which belongs to the cache kmalloc-cg-192 of size 192 The buggy address is located 132 bytes inside of freed 192-byte region [ffff88807bcd1700, ffff88807bcd17c0) The buggy address belongs to the physical page: page:ffffea0001ef3440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bcd1 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x10() raw: 00fff00000000200 ffff88801244d500 ffffea0000b87990 ffff88801244c650 raw: 0000000000000000 ffff88807bcd1000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 5051, tgid 5050 (syz-executor409), ts 61045679991, free_ts 61034527821 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1360 [inline] cache_grow_begin+0x9b/0x3b0 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] __do_cache_alloc mm/slab.c:3201 [inline] slab_alloc_node mm/slab.c:3249 [inline] __kmem_cache_alloc_node+0x360/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] iopt_alloc_area_pages+0x94/0x560 drivers/iommu/iommufd/io_pagetable.c:234 iopt_map_pages drivers/iommu/iommufd/io_pagetable.c:339 [inline] iopt_map_user_pages+0x205/0x4e0 drivers/iommu/iommufd/io_pagetable.c:404 iommufd_ioas_map+0x329/0x5f0 drivers/iommu/iommufd/ioas.c:222 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2705 release_pages+0xcd8/0x1380 mm/swap.c:1042 folios_put include/linux/mm.h:1486 [inline] folio_batch_move_lru+0x2b7/0x400 mm/swap.c:224 folio_batch_add_and_move+0xd4/0x130 mm/swap.c:234 folio_add_lru+0x376/0x7c0 mm/swap.c:517 folio_add_lru_vma+0xae/0xf0 mm/swap.c:537 wp_page_copy mm/memory.c:3143 [inline] do_wp_page+0x12ed/0x33c0 mm/memory.c:3432 handle_pte_fault mm/memory.c:4964 [inline] __handle_mm_fault+0x1635/0x41c0 mm/memory.c:5089 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243 do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 Memory state around the buggy address: ffff88807bcd1680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807bcd1700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807bcd1780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88807bcd1800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807bcd1880: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ==================================================================