================================================================== BUG: KASAN: use-after-free in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221 Read of size 1 at addr ffff88811a778a67 by task syz-executor344/310 CPU: 0 PID: 310 Comm: syz-executor344 Not tainted 5.10.225-syzkaller-00513-g8d23314f588a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221 ext4_dx_readdir fs/ext4/dir.c:598 [inline] ext4_readdir+0x2dde/0x37c0 fs/ext4/dir.c:142 iterate_dir+0x265/0x580 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fd2f4f7fd63 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 b2 4a fb ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 RSP: 002b:00007fff0bb7fdd8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555592327830 RCX: 00007fd2f4f7fd63 RDX: 0000000000008000 RSI: 0000555592327830 RDI: 0000000000000004 RBP: 0000555592327804 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8 R13: 0000000000000010 R14: 0000555592327800 R15: 00007fff0bb82050 Allocated by task 0: (stack is not available) Freed by task 290: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x5c6/0x6f0 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] _kfree_skb_defer net/core/skbuff.c:887 [inline] napi_consume_skb+0x18b/0x490 net/core/skbuff.c:929 free_old_xmit_skbs+0x119/0x290 drivers/net/virtio_net.c:1468 virtnet_poll_cleantx drivers/net/virtio_net.c:1511 [inline] virtnet_poll+0x317/0x11f0 drivers/net/virtio_net.c:1528 napi_poll net/core/dev.c:6854 [inline] net_rx_action+0x516/0x10d0 net/core/dev.c:6924 __do_softirq+0x268/0x5bb kernel/softirq.c:309 The buggy address belongs to the object at ffff88811a778800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 615 bytes inside of 1024-byte region [ffff88811a778800, ffff88811a778c00) The buggy address belongs to the page: page:ffffea000469de00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a778 head:ffffea000469de00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 290, ts 43527880184, free_ts 43526389499 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xbc/0x510 net/core/skbuff.c:212 __napi_alloc_skb+0x15d/0x2e0 net/core/skbuff.c:522 napi_alloc_skb include/linux/skbuff.h:2951 [inline] page_to_skb+0x3d/0x900 drivers/net/virtio_net.c:412 receive_mergeable drivers/net/virtio_net.c:1019 [inline] receive_buf+0xe79/0x53d0 drivers/net/virtio_net.c:1129 virtnet_receive drivers/net/virtio_net.c:1421 [inline] virtnet_poll+0x5cf/0x11f0 drivers/net/virtio_net.c:1530 napi_poll net/core/dev.c:6854 [inline] net_rx_action+0x516/0x10d0 net/core/dev.c:6924 __do_softirq+0x268/0x5bb kernel/softirq.c:309 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629 free_compound_page+0x73/0x90 mm/page_alloc.c:710 destroy_compound_page include/linux/mm.h:959 [inline] __put_compound_page+0x73/0xb0 mm/swap.c:117 __put_page+0xc0/0xe0 mm/swap.c:133 put_page include/linux/mm.h:1257 [inline] __skb_frag_unref include/linux/skbuff.h:3100 [inline] skb_release_data+0x240/0x6f0 net/core/skbuff.c:620 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:694 sk_eat_skb include/net/sock.h:2645 [inline] tcp_recvmsg+0x1765/0x3590 net/ipv4/tcp.c:2345 inet_recvmsg+0x158/0x500 net/ipv4/af_inet.c:866 sock_recvmsg_nosec net/socket.c:905 [inline] sock_recvmsg net/socket.c:923 [inline] sock_read_iter+0x353/0x480 net/socket.c:996 call_read_iter include/linux/fs.h:2015 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x990/0xba0 fs/read_write.c:496 ksys_read+0x199/0x2c0 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:642 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88811a778900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811a778980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811a778a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811a778a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811a778b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================