================================================================== BUG: KASAN: use-after-free in _vm_unmap_aliases+0x188/0x380 mm/vmalloc.c:1687 Read of size 8 at addr ffff88811ca69600 by task syz-executor.3/15944 CPU: 0 PID: 15944 Comm: syz-executor.3 Not tainted 5.4.44-syzkaller-00692-g8b41eaf1ffa9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x14a/0x1ce lib/dump_stack.c:118 print_address_description+0x93/0x620 mm/kasan/report.c:374 __kasan_report+0x16d/0x1e0 mm/kasan/report.c:506 kasan_report+0x34/0x60 mm/kasan/common.c:634 _vm_unmap_aliases+0x188/0x380 mm/vmalloc.c:1687 change_page_attr_set_clr+0x2ae/0x700 arch/x86/mm/pageattr.c:1713 change_page_attr_clear arch/x86/mm/pageattr.c:1770 [inline] set_memory_ro+0xa4/0xe0 arch/x86/mm/pageattr.c:1903 bpf_jit_binary_lock_ro include/linux/filter.h:844 [inline] bpf_int_jit_compile+0x6e9f/0x72b0 arch/x86/net/bpf_jit_comp.c:1179 bpf_prog_select_runtime+0x666/0x910 kernel/bpf/core.c:1738 bpf_prog_load kernel/bpf/syscall.c:1726 [inline] __do_sys_bpf+0x82f8/0xbed0 kernel/bpf/syscall.c:2883 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff320d6cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004da900 RCX: 000000000045ca69 RDX: 0000000000000064 RSI: 00000000202a0fb8 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000006a R14: 00000000004c32f4 R15: 00007ff320d6d6d4 Allocated by task 142: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x12c/0x1c0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2766 [inline] slab_alloc mm/slub.c:2774 [inline] kmem_cache_alloc+0x1d5/0x260 mm/slub.c:2779 kmem_cache_alloc_node include/linux/slab.h:427 [inline] alloc_vmap_area+0x164/0x1bc0 mm/vmalloc.c:1068 new_vmap_block mm/vmalloc.c:1473 [inline] vb_alloc mm/vmalloc.c:1621 [inline] vm_map_ram+0x428/0x950 mm/vmalloc.c:1785 ion_clear_pages drivers/staging/android/ion/ion_buffer.c:98 [inline] ion_sglist_zero drivers/staging/android/ion/ion_buffer.c:126 [inline] ion_buffer_zero+0x3b0/0x490 drivers/staging/android/ion/ion_buffer.c:186 ion_system_heap_free+0x9f/0x330 drivers/staging/android/ion/heaps/ion_system_heap.c:168 ion_buffer_release+0xd4/0x250 drivers/staging/android/ion/ion_buffer.c:215 ion_heap_deferred_free+0xd4/0x590 drivers/staging/android/ion/ion_heap.c:119 kthread+0x2df/0x300 kernel/kthread.c:255 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Freed by task 15948: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x181/0x230 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1424 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1457 slab_free mm/slub.c:3014 [inline] kmem_cache_free+0xac/0x600 mm/slub.c:3030 merge_or_add_vmap_area mm/vmalloc.c:725 [inline] __purge_vmap_area_lazy+0x5c4/0x18b0 mm/vmalloc.c:1288 _vm_unmap_aliases+0x2f7/0x380 mm/vmalloc.c:1705 change_page_attr_set_clr+0x2ae/0x700 arch/x86/mm/pageattr.c:1713 change_page_attr_clear arch/x86/mm/pageattr.c:1770 [inline] set_memory_ro+0xa4/0xe0 arch/x86/mm/pageattr.c:1903 bpf_jit_binary_lock_ro include/linux/filter.h:844 [inline] bpf_int_jit_compile+0x6e9f/0x72b0 arch/x86/net/bpf_jit_comp.c:1179 bpf_prog_select_runtime+0x666/0x910 kernel/bpf/core.c:1738 bpf_prog_load kernel/bpf/syscall.c:1726 [inline] __do_sys_bpf+0x82f8/0xbed0 kernel/bpf/syscall.c:2883 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88811ca69600 which belongs to the cache vmap_area of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff88811ca69600, ffff88811ca69640) The buggy address belongs to the page: page:ffffea0004729a40 refcount:1 mapcount:0 mapping:ffff8881da822c80 index:0x0 flags: 0x8000000000000200(slab) raw: 8000000000000200 ffffea0004386cc0 0000000300000003 ffff8881da822c80 raw: 0000000000000000 00000000002a002a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88811ca69500: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb ffff88811ca69580: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc >ffff88811ca69600: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb ^ ffff88811ca69680: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb ffff88811ca69700: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc 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