================================================================== BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38 Read of size 8 at addr ffff8880125c2958 by task syz-executor.1/11514 CPU: 0 PID: 11514 Comm: syz-executor.1 Not tainted 5.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:120 print_address_description+0x5f/0x3a0 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report+0x15e/0x200 mm/kasan/report.c:413 squashfs_get_id+0xb9/0x1c0 fs/squashfs/id.c:38 squashfs_new_inode fs/squashfs/inode.c:51 [inline] squashfs_read_inode+0x19d/0x2690 fs/squashfs/inode.c:120 squashfs_fill_super+0x1668/0x1c60 fs/squashfs/super.c:310 get_tree_bdev+0x406/0x630 fs/super.c:1291 vfs_get_tree+0x86/0x270 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x17ad/0x2a00 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount+0x28c/0x320 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x46702a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f140d748fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000200000c0 RCX: 000000000046702a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f140d749000 RBP: 00007f140d749040 R08: 00007f140d749040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f140d749000 R15: 0000000020000140 Allocated by task 11514: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc+0xbd/0xf0 mm/kasan/common.c:429 kasan_kmalloc include/linux/kasan.h:219 [inline] __kmalloc+0xaf/0x330 mm/slub.c:3971 kmalloc_array include/linux/slab.h:592 [inline] kcalloc+0x2b/0x40 include/linux/slab.h:621 squashfs_read_table+0x50/0x3b0 fs/squashfs/cache.c:417 squashfs_read_id_index_table+0x7c/0x100 fs/squashfs/id.c:77 squashfs_fill_super+0x1181/0x1c60 fs/squashfs/super.c:238 get_tree_bdev+0x406/0x630 fs/super.c:1291 vfs_get_tree+0x86/0x270 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x17ad/0x2a00 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount+0x28c/0x320 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 11514: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:356 ____kasan_slab_free+0xe2/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0xd1/0x2a0 mm/slub.c:4125 squashfs_read_table+0x364/0x3b0 fs/squashfs/cache.c:435 squashfs_read_id_index_table+0x7c/0x100 fs/squashfs/id.c:77 squashfs_fill_super+0x1181/0x1c60 fs/squashfs/super.c:238 get_tree_bdev+0x406/0x630 fs/super.c:1291 vfs_get_tree+0x86/0x270 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x17ad/0x2a00 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount+0x28c/0x320 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880125c2938 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 24 bytes to the right of 8-byte region [ffff8880125c2938, ffff8880125c2940) The buggy address belongs to the page: page:00000000ce77e3f0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x125c2 flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00006a9f00 0000001000000010 ffff888011041c80 raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880125c2800: fc fc fc fc fa fc fc fc fc 00 fc fc fc fc fa fc ffff8880125c2880: fc fc fc 00 fc fc fc fc fb fc fc fc fc fa fc fc >ffff8880125c2900: fc fc 00 fc fc fc fc fa fc fc fc fc 00 fc fc fc ^ ffff8880125c2980: fc fa fc fc fc fc fb fc fc fc fc fb fc fc fc fc ffff8880125c2a00: fb fc fc fc fc fb fc fc fc fc fb fc fc fc fc fb ==================================================================