================================================================== BUG: KASAN: use-after-free in crc16+0x216/0x2a0 lib/crc16.c:58 Read of size 1 at addr ffff88811eeb9000 by task syz-executor404/328 CPU: 0 PID: 328 Comm: syz-executor404 Not tainted 5.15.94-syzkaller-03204-g5448b2fda85f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 crc16+0x216/0x2a0 lib/crc16.c:58 ext4_group_desc_csum+0x882/0xb90 fs/ext4/super.c:2840 ext4_group_desc_csum_set+0x1d8/0x270 fs/ext4/super.c:2863 ext4_free_blocks+0x1c48/0x2ce0 fs/ext4/mballoc.c:6113 ext4_remove_blocks fs/ext4/extents.c:2525 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2709 [inline] ext4_ext_remove_space+0x29b2/0x4a60 fs/ext4/extents.c:2957 ext4_ext_truncate+0x19a/0x240 fs/ext4/extents.c:4419 ext4_truncate+0x96c/0xfa0 fs/ext4/inode.c:4276 ext4_evict_inode+0xcee/0x14e0 fs/ext4/inode.c:290 evict+0x2a3/0x630 fs/inode.c:587 iput_final fs/inode.c:1663 [inline] iput+0x63b/0x7e0 fs/inode.c:1689 do_unlinkat+0x4db/0x910 fs/namei.c:4228 __do_sys_unlink fs/namei.c:4269 [inline] __se_sys_unlink fs/namei.c:4267 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4267 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa894d97519 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff8175b138 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa894d97519 RDX: ffffffffffffffc0 RSI: 0000000000000080 RDI: 0000000020000200 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8175b170 R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 Allocated by task 328: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3238 [inline] slab_alloc mm/slub.c:3246 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3251 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x149/0x550 mm/mempool.c:393 bio_alloc_bioset+0x12a/0x950 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] submit_bh_wbc+0x1d1/0x6c0 fs/buffer.c:3028 submit_bh+0x28/0x40 fs/buffer.c:3062 __ext4_read_bh fs/ext4/super.c:155 [inline] ext4_read_bh+0x197/0x240 fs/ext4/super.c:179 ext4_read_bh_lock fs/ext4/super.c:194 [inline] __ext4_sb_bread_gfp+0x1cf/0x220 fs/ext4/super.c:216 ext4_sb_bread_unmovable fs/ext4/super.c:233 [inline] ext4_fill_super+0x34d2/0x9680 fs/ext4/super.c:4346 mount_bdev+0x281/0x3b0 fs/super.c:1369 ext4_mount+0x34/0x40 fs/ext4/super.c:6564 legacy_get_tree+0xf1/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1499 do_new_mount+0x28b/0xac0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 13: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3517 [inline] kmem_cache_free+0x116/0x2e0 mm/slub.c:3533 mempool_free_slab+0x1d/0x30 mm/mempool.c:520 mempool_free+0xd7/0x310 mm/mempool.c:502 bio_free+0x153/0x1a0 block/bio.c:239 bio_put+0x9a/0x4b0 block/bio.c:700 end_bio_bh_io_sync+0xbf/0x110 fs/buffer.c:3008 bio_endio+0x64a/0x670 block/bio.c:1479 req_bio_endio block/blk-core.c:264 [inline] blk_update_request+0x683/0x1200 block/blk-core.c:1443 blk_mq_end_request+0x43/0x80 block/blk-mq.c:577 lo_complete_rq+0x151/0x270 drivers/block/loop.c:530 blk_complete_reqs block/blk-mq.c:589 [inline] blk_done_softirq+0xfd/0x140 block/blk-mq.c:594 __do_softirq+0x26d/0x5bf kernel/softirq.c:565 The buggy address belongs to the object at ffff88811eeb9000 which belongs to the cache bio-224 of size 224 The buggy address is located 0 bytes inside of 224-byte region [ffff88811eeb9000, ffff88811eeb90e0) The buggy address belongs to the page: page:ffffea00047bae40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11eeb9 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881003a6000 raw: 0000000000000000 00000000000c000c 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 0x92800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC), pid 328, ts 24057221355, free_ts 24057165969 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2502 prep_new_page mm/page_alloc.c:2508 [inline] get_page_from_freelist+0x2c14/0x2cf0 mm/page_alloc.c:4291 __alloc_pages+0x386/0x7b0 mm/page_alloc.c:5569 allocate_slab mm/slub.c:1930 [inline] new_slab+0x92/0x490 mm/slub.c:1993 ___slab_alloc+0x39e/0x830 mm/slub.c:3026 __slab_alloc+0x4a/0x90 mm/slub.c:3113 slab_alloc_node mm/slub.c:3204 [inline] slab_alloc mm/slub.c:3246 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3251 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x149/0x550 mm/mempool.c:393 bio_alloc_bioset+0x12a/0x950 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] submit_bh_wbc+0x1d1/0x6c0 fs/buffer.c:3028 submit_bh+0x28/0x40 fs/buffer.c:3062 __ext4_read_bh fs/ext4/super.c:155 [inline] ext4_read_bh+0x197/0x240 fs/ext4/super.c:179 ext4_read_bh_lock fs/ext4/super.c:194 [inline] __ext4_sb_bread_gfp+0x1cf/0x220 fs/ext4/super.c:216 ext4_sb_bread_unmovable fs/ext4/super.c:233 [inline] ext4_fill_super+0x7a5/0x9680 fs/ext4/super.c:3951 mount_bdev+0x281/0x3b0 fs/super.c:1369 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1370 [inline] free_pcp_prepare mm/page_alloc.c:1442 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3441 free_unref_page_list+0x15d/0x980 mm/page_alloc.c:3562 release_pages+0x1310/0x1370 mm/swap.c:1009 __pagevec_release+0x84/0x100 mm/swap.c:1029 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0x482/0x1160 mm/truncate.c:329 truncate_inode_pages+0x24/0x30 mm/truncate.c:425 kill_bdev block/bdev.c:77 [inline] set_blocksize+0x30d/0x380 block/bdev.c:157 sb_set_blocksize block/bdev.c:166 [inline] sb_min_blocksize+0xd7/0x190 block/bdev.c:182 ext4_fill_super+0x707/0x9680 fs/ext4/super.c:3934 mount_bdev+0x281/0x3b0 fs/super.c:1369 ext4_mount+0x34/0x40 fs/ext4/super.c:6564 legacy_get_tree+0xf1/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1499 do_new_mount+0x28b/0xac0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 Memory state around the buggy address: ffff88811eeb8f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811eeb8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811eeb9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811eeb9080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88811eeb9100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================