================================================================== BUG: KASAN: use-after-free in rdma_close+0xaf/0xc0 net/9p/trans_rdma.c:555 Read of size 8 at addr ffff88807c0b9408 by task syz-executor.2/10444 CPU: 0 PID: 10444 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 rdma_close+0xaf/0xc0 net/9p/trans_rdma.c:555 p9_client_destroy+0xbe/0x370 net/9p/client.c:1040 p9_client_create+0x728/0xf20 net/9p/client.c:1027 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6e8828b5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f6e89457168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6e883abf80 RCX: 00007f6e8828b5a9 RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040 RBP: 00007f6e882e6580 R08: 0000000020000280 R09: 0000000000000000 R10: 0000000000800091 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5afa925f R14: 00007f6e89457300 R15: 0000000000022000 Allocated by task 10444: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:695 [inline] alloc_rdma net/9p/trans_rdma.c:567 [inline] rdma_create_trans+0x24f/0x13d0 net/9p/trans_rdma.c:644 p9_client_create+0x7ef/0xf20 net/9p/client.c:992 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 10444: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 rdma_destroy_trans+0x196/0x210 net/9p/trans_rdma.c:380 rdma_create_trans+0x1076/0x13d0 net/9p/trans_rdma.c:735 p9_client_create+0x7ef/0xf20 net/9p/client.c:992 v9fs_session_init+0x1e2/0x1810 fs/9p/v9fs.c:408 v9fs_mount+0xba/0xc90 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1326/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807c0b9400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88807c0b9400, ffff88807c0b9600) The buggy address belongs to the physical page: page:ffffea0001f02e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c0b8 head:ffffea0001f02e00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011841c80 dead000080100010 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 10430, tgid 10415 (syz-executor.0), ts 479484802052, free_ts 475238483953 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 __do_kmalloc_node mm/slab_common.c:933 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:954 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434 alloc_skb include/linux/skbuff.h:1258 [inline] alloc_skb_with_frags+0x93/0x6c0 net/core/skbuff.c:6022 sock_alloc_send_pskb+0x7a3/0x930 net/core/sock.c:2719 packet_alloc_skb net/packet/af_packet.c:2921 [inline] packet_snd net/packet/af_packet.c:3016 [inline] packet_sendmsg+0x1826/0x5500 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 sock_no_sendpage+0x108/0x150 net/core/sock.c:3219 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3561 kernel_sendpage net/socket.c:3558 [inline] sock_sendpage+0xdf/0x140 net/socket.c:1054 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2532 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:754 [inline] slab_alloc_node mm/slub.c:3336 [inline] kmem_cache_alloc_node+0x2ff/0x400 mm/slub.c:3381 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:422 alloc_skb include/linux/skbuff.h:1258 [inline] alloc_skb_with_frags+0x93/0x6c0 net/core/skbuff.c:6022 sock_alloc_send_pskb+0x7a3/0x930 net/core/sock.c:2719 packet_alloc_skb net/packet/af_packet.c:2921 [inline] packet_snd net/packet/af_packet.c:3016 [inline] packet_sendmsg+0x1826/0x5500 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 sock_no_sendpage+0x108/0x150 net/core/sock.c:3219 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3561 kernel_sendpage net/socket.c:3558 [inline] sock_sendpage+0xdf/0x140 net/socket.c:1054 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:361 Memory state around the buggy address: ffff88807c0b9300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807c0b9380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807c0b9400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807c0b9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c0b9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================