================================================================== 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 ffff88807413c584 by task syz-executor.0/9397 CPU: 1 PID: 9397 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-00082-gc0a572d9d32f #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+0x19d/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: 0033:0x7f08c768c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f08c83fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f08c77ac050 RCX: 00007f08c768c389 RDX: 00000000200001c0 RSI: 0000000000003b86 RDI: 0000000000000003 RBP: 00007f08c76d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd301533bf R14: 00007f08c83fe300 R15: 0000000000022000 Allocated by task 9396: 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+0x19d/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 9402: 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+0x19d/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 ffff88807413c500 which belongs to the cache kmalloc-cg-192 of size 192 The buggy address is located 132 bytes inside of freed 192-byte region [ffff88807413c500, ffff88807413c5c0) The buggy address belongs to the physical page: page:ffffea0001d04f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7413c memcg:ffff88807767e601 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x10() raw: 00fff00000000200 ffff88801244d500 ffffea0000aab510 ffffea0001cc9b50 raw: 0000000000000000 ffff88807413c000 0000000100000010 ffff88807767e601 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x3460c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 6568, tgid 6556 (syz-executor.2), ts 386010310537, free_ts 377742163454 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 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:697 [inline] kvzalloc include/linux/slab.h:705 [inline] netif_alloc_rx_queues net/core/dev.c:9883 [inline] alloc_netdev_mqs+0xbc9/0x1250 net/core/dev.c:10694 __ip_tunnel_create+0x201/0x5b0 net/ipv4/ip_tunnel.c:254 ip_tunnel_init_net+0x1f9/0x5d0 net/ipv4/ip_tunnel.c:1091 ops_init+0xb9/0x6b0 net/core/net_namespace.c:136 setup_net+0x5d1/0xc50 net/core/net_namespace.c:339 copy_net_ns+0x4ee/0x8e0 net/core/net_namespace.c:491 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228 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+0x33/0x370 mm/page_alloc.c:2659 tlb_batch_list_free mm/mmu_gather.c:113 [inline] tlb_finish_mmu+0x1a7/0x7e0 mm/mmu_gather.c:394 exit_mmap+0x2b2/0x930 mm/mmap.c:3120 __mmput+0x128/0x4d0 kernel/fork.c:1351 mmput+0x60/0x70 kernel/fork.c:1373 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b0/0x29b0 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x2318/0x25b0 kernel/signal.c:2876 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807413c480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88807413c500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807413c580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88807413c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807413c680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================