================================================================== BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51 Read of size 8 at addr ffff8880a9101698 by task syz-executor533/8104 CPU: 1 PID: 8104 Comm: syz-executor533 Not tainted 4.19.166-syzkaller #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+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51 squashfs_new_inode fs/squashfs/inode.c:68 [inline] squashfs_read_inode+0x1ee/0x1b40 fs/squashfs/inode.c:133 squashfs_fill_super+0x1655/0x1c00 fs/squashfs/super.c:318 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x30c fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446d2a Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007ffc6644bf98 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc6644bff0 RCX: 0000000000446d2a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc6644bfb0 RBP: 00007ffc6644bfb0 R08: 00007ffc6644bff0 R09: 00007ffc00000015 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 Allocated by task 8104: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] squashfs_read_table+0x42/0x1e3 fs/squashfs/cache.c:426 squashfs_read_id_index_table+0xab/0x120 fs/squashfs/id.c:90 squashfs_fill_super+0xcfb/0x1c00 fs/squashfs/super.c:246 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x30c fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 rh_call_control drivers/usb/core/hcd.c:728 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:838 [inline] usb_hcd_submit_urb+0xb93/0x23c0 drivers/usb/core/hcd.c:1651 usb_submit_urb+0xb2f/0x13b0 drivers/usb/core/urb.c:571 usb_start_wait_urb+0x108/0x4c0 drivers/usb/core/message.c:57 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 get_hub_status drivers/usb/core/hub.c:553 [inline] hub_hub_status+0xd5/0x380 drivers/usb/core/hub.c:904 hub_configure drivers/usb/core/hub.c:1574 [inline] hub_probe+0x1b0a/0x2e10 drivers/usb/core/hub.c:1849 usb_probe_interface+0x317/0x9d0 drivers/usb/core/driver.c:361 really_probe+0x622/0xbd0 drivers/base/dd.c:504 driver_probe_device+0x218/0x340 drivers/base/dd.c:665 __device_attach_driver+0x29e/0x370 drivers/base/dd.c:752 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:464 __device_attach+0x226/0x470 drivers/base/dd.c:820 bus_probe_device+0x1ea/0x2a0 drivers/base/bus.c:524 device_add+0xb37/0x16d0 drivers/base/core.c:2154 usb_set_configuration+0x1016/0x18c0 drivers/usb/core/message.c:2016 generic_probe+0xcb/0x130 drivers/usb/core/generic.c:174 usb_probe_device+0xb8/0x150 drivers/usb/core/driver.c:266 really_probe+0x622/0xbd0 drivers/base/dd.c:504 driver_probe_device+0x218/0x340 drivers/base/dd.c:665 __device_attach_driver+0x29e/0x370 drivers/base/dd.c:752 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:464 __device_attach+0x226/0x470 drivers/base/dd.c:820 bus_probe_device+0x1ea/0x2a0 drivers/base/bus.c:524 device_add+0xb37/0x16d0 drivers/base/core.c:2154 usb_new_device+0xa06/0x1930 drivers/usb/core/hub.c:2519 register_root_hub drivers/usb/core/hcd.c:1105 [inline] usb_add_hcd+0xd0b/0x1ce0 drivers/usb/core/hcd.c:2882 vhci_hcd_probe+0x1c0/0x3a0 drivers/usb/usbip/vhci_hcd.c:1369 platform_drv_probe+0xd4/0x1b0 drivers/base/platform.c:584 really_probe+0x622/0xbd0 drivers/base/dd.c:504 driver_probe_device+0x218/0x340 drivers/base/dd.c:665 __device_attach_driver+0x29e/0x370 drivers/base/dd.c:752 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:464 __device_attach+0x226/0x470 drivers/base/dd.c:820 bus_probe_device+0x1ea/0x2a0 drivers/base/bus.c:524 device_add+0xb37/0x16d0 drivers/base/core.c:2154 platform_device_add+0x364/0x830 drivers/base/platform.c:420 vhci_hcd_init+0x341/0x485 drivers/usb/usbip/vhci_hcd.c:1539 do_one_initcall+0xf1/0x734 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x9a6/0xa98 init/main.c:1145 kernel_init+0xd/0x1c0 init/main.c:1062 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8880a9101680 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 24 bytes inside of 32-byte region [ffff8880a9101680, ffff8880a91016a0) The buggy address belongs to the page: page:ffffea0002a44040 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880a9101fc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002a40f08 ffff88813bff1248 ffff88813bff01c0 raw: ffff8880a9101fc1 ffff8880a9101000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a9101580: 00 04 fc fc fc fc fc fc 00 04 fc fc fc fc fc fc ffff8880a9101600: 00 04 fc fc fc fc fc fc 00 04 fc fc fc fc fc fc >ffff8880a9101680: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880a9101700: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc ffff8880a9101780: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc ==================================================================