EXT4-fs warning (device sda1): ext4_resize_fs:1916: can't read last block, resize aborted ================================================================== BUG: KASAN: use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:328 [inline] BUG: KASAN: use-after-free in fuse_dev_do_read.isra.27+0x1659/0x1920 fs/fuse/dev.c:1318 Read of size 8 at addr ffff88017bad6630 by task syz-executor4/14483 CPU: 1 PID: 14483 Comm: syz-executor4 Not tainted 4.19.0-rc3+ #236 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 constant_test_bit arch/x86/include/asm/bitops.h:328 [inline] fuse_dev_do_read.isra.27+0x1659/0x1920 fs/fuse/dev.c:1318 fuse_dev_read+0x1a9/0x250 fs/fuse/dev.c:1360 call_read_iter include/linux/fs.h:1802 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x6ac/0x9b0 fs/read_write.c:418 vfs_read+0x17f/0x3c0 fs/read_write.c:452 ksys_read+0x101/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4572d9 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe93aabdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fe93aabe6d4 RCX: 00000000004572d9 RDX: 0000000000001000 RSI: 00000000200020c0 RDI: 0000000000000003 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d44d0 R14: 00000000004c8d2c R15: 0000000000000001 Allocated by task 14478: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 __fuse_request_alloc+0x27/0xf0 fs/fuse/dev.c:58 fuse_request_alloc fs/fuse/dev.c:89 [inline] __fuse_get_req+0x1f7/0x9e0 fs/fuse/dev.c:164 fuse_get_req fs/fuse/dev.c:194 [inline] fuse_simple_request+0x28/0x730 fs/fuse/dev.c:549 fuse_setxattr+0x3df/0x650 fs/fuse/xattr.c:37 fuse_xattr_set+0x3b/0x70 fs/fuse/xattr.c:192 __vfs_setxattr+0x124/0x180 fs/xattr.c:149 __vfs_setxattr_noperm+0x11d/0x410 fs/xattr.c:180 vfs_setxattr+0xd8/0x100 fs/xattr.c:223 setxattr+0x2ea/0x450 fs/xattr.c:450 path_setxattr+0x1e3/0x230 fs/xattr.c:469 __do_sys_setxattr fs/xattr.c:484 [inline] __se_sys_setxattr fs/xattr.c:480 [inline] __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:480 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14489: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3756 fuse_request_free+0x8b/0xa0 fs/fuse/dev.c:104 fuse_put_request+0x2a6/0x350 fs/fuse/dev.c:304 request_end+0xba/0xaa0 fs/fuse/dev.c:414 fuse_dev_do_write+0x192e/0x36e0 fs/fuse/dev.c:1915 fuse_dev_write+0x19a/0x240 fs/fuse/dev.c:1939 call_write_iter include/linux/fs.h:1808 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6b8/0x9f0 fs/read_write.c:487 vfs_write+0x1fc/0x560 fs/read_write.c:549 EXT4-fs warning (device sda1): ext4_resize_fs:1916: can't read last block, resize aborted ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88017bad6600 which belongs to the cache fuse_request of size 448 The buggy address is located 48 bytes inside of 448-byte region [ffff88017bad6600, ffff88017bad67c0) The buggy address belongs to the page: page:ffffea0005eeb580 count:1 mapcount:0 mapping:ffff8801d5313b40 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006194788 ffff8801d5312348 ffff8801d5313b40 raw: 0000000000000000 ffff88017bad6000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88017bad6500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88017bad6580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88017bad6600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88017bad6680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88017bad6700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================