================================================================== BUG: KASAN: slab-use-after-free in v9fs_stat2inode_dotl+0xb3f/0xce0 fs/9p/vfs_inode_dotl.c:569 Read of size 8 at addr ffff8880234f5700 by task syz-executor.1/7424 CPU: 3 PID: 7424 Comm: syz-executor.1 Not tainted 6.9.0-rc1-syzkaller-00009-g7033999ecd7b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 v9fs_stat2inode_dotl+0xb3f/0xce0 fs/9p/vfs_inode_dotl.c:569 v9fs_fid_iget_dotl+0x1cb/0x260 fs/9p/vfs_inode_dotl.c:85 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] v9fs_mount+0x515/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f61d9e7dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f61dacc30c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f61d9fabf80 RCX: 00007f61d9e7dda9 RDX: 0000000020000140 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 00007f61d9eca47a R08: 0000000020000200 R09: 0000000000000000 R10: 0000000000200400 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f61d9fabf80 R15: 00007ffd529c0948 Allocated by task 7424: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:628 [inline] p9_client_getattr_dotl+0x4c/0x1e0 net/9p/client.c:1726 v9fs_fid_iget_dotl+0xe7/0x260 fs/9p/vfs_inode_dotl.c:73 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] v9fs_mount+0x515/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 7424: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x129/0x390 mm/slub.c:4390 v9fs_fid_iget_dotl+0x195/0x260 fs/9p/vfs_inode_dotl.c:81 v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] v9fs_mount+0x515/0xa90 fs/9p/vfs_super.c:142 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff8880234f5700 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of freed 192-byte region [ffff8880234f5700, ffff8880234f57c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x234f5 ksm flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000800 ffff888015442a00 ffffea000075f940 dead000000000003 raw: 0000000000000000 0000000080100010 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 0x12c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY), pid 10, tgid 10 (kworker/u32:0), ts 9586601581, free_ts 9465029721 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x3b4/0x440 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] bio_kmalloc+0x41/0x70 block/bio.c:605 bio_copy_kern block/blk-map.c:491 [inline] blk_rq_map_kern+0x414/0x780 block/blk-map.c:797 scsi_execute_cmd+0xc59/0xf40 drivers/scsi/scsi_lib.c:309 sr_do_ioctl+0x21c/0x830 drivers/scsi/sr_ioctl.c:207 sr_read_tocentry.isra.0+0x181/0x540 drivers/scsi/sr_ioctl.c:91 sr_audio_ioctl+0x284/0x2f0 drivers/scsi/sr_ioctl.c:462 cdrom_get_last_written+0x1f1/0x790 drivers/cdrom/cdrom.c:2867 get_sectorsize+0x2c5/0x570 drivers/scsi/sr.c:757 sr_revalidate_disk drivers/scsi/sr.c:485 [inline] sr_revalidate_disk drivers/scsi/sr.c:477 [inline] sr_probe+0x12e7/0x15f0 drivers/scsi/sr.c:689 page last free pid 1090 tgid 1090 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 vfree+0x181/0x7a0 mm/vmalloc.c:3324 free_partitions block/partitions/core.c:110 [inline] blk_add_partitions block/partitions/core.c:631 [inline] bdev_disk_changed+0x1036/0x1630 block/partitions/core.c:686 blkdev_get_whole+0x189/0x260 block/bdev.c:674 bdev_open+0x2ef/0xe90 block/bdev.c:881 bdev_file_open_by_dev block/bdev.c:980 [inline] bdev_file_open_by_dev+0x1ba/0x280 block/bdev.c:955 disk_scan_partitions+0x1e9/0x320 block/genhd.c:369 device_add_disk+0xfb2/0x1270 block/genhd.c:512 sd_probe+0xa71/0xfe0 drivers/scsi/sd.c:3921 call_driver_probe drivers/base/dd.c:578 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:656 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:798 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:828 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:956 bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:457 __device_attach_async_helper+0x1d3/0x290 drivers/base/dd.c:985 Memory state around the buggy address: ffff8880234f5600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880234f5680: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880234f5700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880234f5780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880234f5800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================