================================================================== BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:51 Read of size 8 at addr ffff8880a7499660 by task syz-executor.4/6298 CPU: 0 PID: 6298 Comm: syz-executor.4 Not tainted 4.19.148-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+0x22c/0x33e lib/dump_stack.c:118 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256 kasan_report_error.cold+0x66/0xb9 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+0x1bc/0x1f0 fs/squashfs/id.c:51 squashfs_new_inode fs/squashfs/inode.c:64 [inline] squashfs_read_inode+0x197/0x1940 fs/squashfs/inode.c:133 squashfs_fill_super+0x1277/0x190a fs/squashfs/super.c:318 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x318 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+0x51c/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+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4607ea Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 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 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fe99d191a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe99d191b20 RCX: 00000000004607ea RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe99d191ae0 RBP: 00007fe99d191ae0 R08: 00007fe99d191b20 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00000000200003c0 R15: 0000000020000040 Allocated by task 4702: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x4f0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] shmem_initxattrs+0x14d/0x220 mm/shmem.c:3158 security_inode_init_security+0x1c4/0x370 security/security.c:498 shmem_mknod+0xc9/0x1f0 mm/shmem.c:2838 lookup_open+0x86c/0x19c0 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x10d6/0x2e90 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3710: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x250 mm/slab.c:3822 kvfree+0x59/0x60 mm/util.c:452 getxattr+0x1c7/0x2b0 fs/xattr.c:620 path_getxattr+0xb6/0x150 fs/xattr.c:635 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a7499640 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of 32-byte region [ffff8880a7499640, ffff8880a7499660) The buggy address belongs to the page: page:ffffea00029d2640 count:1 mapcount:0 mapping:ffff88812c3f61c0 index:0xffff8880a7499fc1 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea000256fa08 ffffea00022990c8 ffff88812c3f61c0 raw: ffff8880a7499fc1 ffff8880a7499000 0000000100000038 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7499500: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a7499580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8880a7499600: 00 fc fc fc fc fc fc fc 00 00 01 fc fc fc fc fc ^ ffff8880a7499680: 00 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc ffff8880a7499700: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================