EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_xattr_ibody_get:591: inode #18: comm syz-executor.3: corrupted in-inode xattr ================================================================== BUG: KASAN: use-after-free in get_max_inline_xattr_value_size+0x373/0x510 fs/ext4/inline.c:61 Read of size 4 at addr ffff8881eade6084 by task syz-executor.3/500 CPU: 1 PID: 500 Comm: syz-executor.3 Not tainted 5.4.219-syzkaller-00002-ga0eae55f26a0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x630 mm/kasan/report.c:384 __kasan_report+0xf6/0x130 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 get_max_inline_xattr_value_size+0x373/0x510 fs/ext4/inline.c:61 ext4_get_max_inline_size+0x139/0x1f0 fs/ext4/inline.c:112 ext4_try_to_write_inline_data+0xd9/0x1750 fs/ext4/inline.c:673 ext4_write_begin+0x247/0x1d50 fs/ext4/inode.c:1312 ext4_da_write_begin+0x4a8/0xf80 fs/ext4/inode.c:3110 generic_perform_write+0x2f9/0x5a0 mm/filemap.c:3311 __generic_file_write_iter+0x239/0x490 mm/filemap.c:3440 ext4_file_write_iter+0x495/0x10e0 fs/ext4/file.c:270 do_iter_readv_writev+0x529/0x740 fs/read_write.c:690 do_iter_write+0x16f/0x570 fs/read_write.c:970 iter_file_splice_write+0x887/0x10f0 fs/splice.c:746 splice_direct_to_actor+0x4c4/0xb20 fs/splice.c:976 do_splice_direct+0x2a0/0x3f0 fs/splice.c:1064 do_sendfile+0x8f2/0xf10 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ce/0x230 fs/read_write.c:1511 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 297: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd0/0x210 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x78/0x4d0 net/core/skbuff.c:198 __napi_alloc_skb+0x11f/0x540 net/core/skbuff.c:516 napi_alloc_skb include/linux/skbuff.h:2877 [inline] page_to_skb+0x39/0x910 drivers/net/virtio_net.c:412 receive_mergeable+0x7e2/0x23d0 drivers/net/virtio_net.c:997 receive_buf+0x140/0x1a30 drivers/net/virtio_net.c:1107 virtnet_receive drivers/net/virtio_net.c:1399 [inline] virtnet_poll+0x4ae/0x1200 drivers/net/virtio_net.c:1508 napi_poll+0x195/0x670 net/core/dev.c:6353 net_rx_action+0x37f/0x9c0 net/core/dev.c:6421 __do_softirq+0x23e/0x643 kernel/softirq.c:292 Freed by task 297: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x178/0x240 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kmem_cache_free+0xa9/0x1d0 mm/slub.c:3096 sk_eat_skb include/net/sock.h:2510 [inline] tcp_recvmsg+0x1663/0x3590 net/ipv4/tcp.c:2179 inet_recvmsg+0x157/0x500 net/ipv4/af_inet.c:842 sock_recvmsg_nosec net/socket.c:872 [inline] sock_recvmsg net/socket.c:890 [inline] sock_read_iter+0x34a/0x430 net/socket.c:968 call_read_iter include/linux/fs.h:1975 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0x5e0/0x760 fs/read_write.c:427 vfs_read+0x166/0x370 fs/read_write.c:461 ksys_read+0x198/0x2c0 fs/read_write.c:587 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881eade6000 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 132 bytes inside of 240-byte region [ffff8881eade6000, ffff8881eade60f0) The buggy address belongs to the page: page:ffffea0007ab7980 refcount:1 mapcount:0 mapping:ffff8881f1ddc000 index:0xffff8881eade68c0 flags: 0x8000000000000200(slab) raw: 8000000000000200 0000000000000000 0000000100000001 ffff8881f1ddc000 raw: ffff8881eade68c0 00000000800c0000 00000001ffffffff 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x194/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x372/0x860 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3e0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x450 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x320/0x4a0 mm/slub.c:2667 __slab_alloc+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0x100/0x210 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x78/0x4d0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1060 [inline] __tcp_send_ack+0x9a/0x580 net/ipv4/tcp_output.c:3720 tcp_recvmsg+0x2190/0x3590 net/ipv4/tcp.c:2195 inet_recvmsg+0x157/0x500 net/ipv4/af_inet.c:842 sock_recvmsg_nosec net/socket.c:872 [inline] sock_recvmsg net/socket.c:890 [inline] sock_read_iter+0x34a/0x430 net/socket.c:968 call_read_iter include/linux/fs.h:1975 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0x5e0/0x760 fs/read_write.c:427 vfs_read+0x166/0x370 fs/read_write.c:461 ksys_read+0x198/0x2c0 fs/read_write.c:587 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] free_pcp_prepare+0x1a4/0x290 mm/page_alloc.c:1233 free_unref_page_prepare mm/page_alloc.c:3085 [inline] free_unref_page mm/page_alloc.c:3134 [inline] free_the_page mm/page_alloc.c:4951 [inline] __free_pages+0x9c/0x250 mm/page_alloc.c:4959 __free_slab+0x22b/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14f/0x180 mm/slub.c:2288 put_cpu_partial+0xb5/0x150 mm/slub.c:2324 __slab_free+0x2ac/0x370 mm/slub.c:2971 qlist_free_all+0x4c/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd0/0x210 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x78/0x4d0 net/core/skbuff.c:198 alloc_skb_fclone include/linux/skbuff.h:1110 [inline] sk_stream_alloc_skb+0x1ee/0xa80 net/ipv4/tcp.c:887 tcp_sendmsg_locked+0xe3f/0x3780 net/ipv4/tcp.c:1296 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1446 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] sock_write_iter+0x33f/0x460 net/socket.c:990 call_write_iter include/linux/fs.h:1981 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5e3/0x780 fs/read_write.c:496 Memory state around the buggy address: ffff8881eade5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881eade6000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881eade6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff8881eade6100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8881eade6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop3): ext4_read_block_bitmap_nowait:430: comm syz-executor.3: Invalid block bitmap block 0 in block_group 0 syz-executor.3 (500) used greatest stack depth: 21400 bytes left