================================================================== BUG: KASAN: slab-use-after-free in sg_assign_page include/linux/scatterlist.h:109 [inline] BUG: KASAN: slab-use-after-free in sg_set_page include/linux/scatterlist.h:139 [inline] BUG: KASAN: slab-use-after-free in __blk_bvec_map_sg block/blk-merge.c:501 [inline] BUG: KASAN: slab-use-after-free in __blk_bios_map_sg block/blk-merge.c:548 [inline] BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0xf74/0xfd0 block/blk-merge.c:575 Read of size 8 at addr ffff88801eef08c0 by task syz-executor.0/7975 CPU: 1 PID: 7975 Comm: syz-executor.0 Not tainted 6.2.0-rc7-next-20230208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 sg_assign_page include/linux/scatterlist.h:109 [inline] sg_set_page include/linux/scatterlist.h:139 [inline] __blk_bvec_map_sg block/blk-merge.c:501 [inline] __blk_bios_map_sg block/blk-merge.c:548 [inline] __blk_rq_map_sg+0xf74/0xfd0 block/blk-merge.c:575 scsi_alloc_sgtables+0x236/0xf70 drivers/scsi/scsi_lib.c:1048 sd_setup_read_write_cmnd drivers/scsi/sd.c:1134 [inline] sd_init_command+0x67a/0x3290 drivers/scsi/sd.c:1258 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1603 [inline] scsi_queue_rq+0x1e7b/0x3a40 drivers/scsi/scsi_lib.c:1737 blk_mq_dispatch_rq_list+0x609/0x20b0 block/blk-mq.c:2059 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:172 [inline] blk_mq_do_dispatch_sched+0x95e/0xc20 block/blk-mq-sched.c:186 __blk_mq_sched_dispatch_requests+0x26d/0x3e0 block/blk-mq-sched.c:312 blk_mq_sched_dispatch_requests+0x10a/0x190 block/blk-mq-sched.c:338 __blk_mq_run_hw_queue+0x2b7/0x480 block/blk-mq.c:2177 __blk_mq_delay_run_hw_queue+0x5f7/0x700 block/blk-mq.c:2253 blk_mq_run_hw_queue+0x3b5/0x560 block/blk-mq.c:2301 blk_mq_sched_insert_requests+0x1d9/0xb30 block/blk-mq-sched.c:492 blk_mq_dispatch_plug_list block/blk-mq.c:2747 [inline] blk_mq_flush_plug_list+0x39c/0xe10 block/blk-mq.c:2789 __blk_flush_plug block/blk-core.c:1150 [inline] blk_finish_plug block/blk-core.c:1174 [inline] blk_finish_plug+0xbb/0x170 block/blk-core.c:1171 __iomap_dio_rw+0xf85/0x1d80 fs/iomap/direct-io.c:602 iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:682 ext4_dio_read_iter fs/ext4/file.c:94 [inline] ext4_file_read_iter+0x4be/0x690 fs/ext4/file.c:145 call_read_iter include/linux/fs.h:1845 [inline] generic_file_splice_read+0x182/0x4b0 fs/splice.c:309 do_splice_to+0x1b9/0x240 fs/splice.c:792 splice_direct_to_actor+0x2ab/0x8a0 fs/splice.c:864 do_splice_direct+0x1ab/0x280 fs/splice.c:973 do_sendfile+0xb19/0x12c0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7582c8c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f75817dd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f7582dac050 RCX: 00007f7582c8c0f9 RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000007 RBP: 00007f7582ce7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001dd00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe1ee2a4ef R14: 00007f75817dd300 R15: 0000000000022000 Allocated by task 7162: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x175/0x320 mm/slub.c:3476 mempool_alloc+0x158/0x360 mm/mempool.c:398 __sg_alloc_table+0x248/0x380 lib/scatterlist.c:318 sg_alloc_table_chained+0x9f/0x1f0 lib/sg_pool.c:133 scsi_alloc_sgtables+0x1cd/0xf70 drivers/scsi/scsi_lib.c:1040 sd_setup_read_write_cmnd drivers/scsi/sd.c:1134 [inline] sd_init_command+0x67a/0x3290 drivers/scsi/sd.c:1258 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1603 [inline] scsi_queue_rq+0x1e7b/0x3a40 drivers/scsi/scsi_lib.c:1737 blk_mq_dispatch_rq_list+0x609/0x20b0 block/blk-mq.c:2059 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:172 [inline] blk_mq_do_dispatch_sched+0x95e/0xc20 block/blk-mq-sched.c:186 __blk_mq_sched_dispatch_requests+0x26d/0x3e0 block/blk-mq-sched.c:312 blk_mq_sched_dispatch_requests+0x10a/0x190 block/blk-mq-sched.c:338 __blk_mq_run_hw_queue+0x2b7/0x480 block/blk-mq.c:2177 __blk_mq_delay_run_hw_queue+0x5f7/0x700 block/blk-mq.c:2253 blk_mq_run_hw_queue+0x3b5/0x560 block/blk-mq.c:2301 blk_mq_sched_insert_requests+0x1d9/0xb30 block/blk-mq-sched.c:492 blk_mq_dispatch_plug_list block/blk-mq.c:2747 [inline] blk_mq_flush_plug_list+0x39c/0xe10 block/blk-mq.c:2789 blk_add_rq_to_plug+0x117/0x4f0 block/blk-mq.c:1297 blk_mq_submit_bio+0xae9/0x2030 block/blk-mq.c:2983 __submit_bio+0x2b7/0x340 block/blk-core.c:602 __submit_bio_noacct_mq block/blk-core.c:679 [inline] submit_bio_noacct_nocheck block/blk-core.c:696 [inline] submit_bio_noacct_nocheck+0x6cd/0x8a0 block/blk-core.c:685 submit_bio_noacct+0xa46/0x1fb0 block/blk-core.c:806 submit_bio block/blk-core.c:842 [inline] submit_bio+0x8f/0x1c0 block/blk-core.c:830 ext4_io_submit+0xa6/0x140 fs/ext4/page-io.c:378 ext4_do_writepages+0x100d/0x30e0 fs/ext4/inode.c:2896 ext4_writepages+0x27c/0x5e0 fs/ext4/inode.c:2964 do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 filemap_fdatawrite_wbc mm/filemap.c:388 [inline] filemap_fdatawrite_wbc+0x147/0x1b0 mm/filemap.c:378 __filemap_fdatawrite_range+0xb8/0xf0 mm/filemap.c:421 filemap_write_and_wait_range mm/filemap.c:676 [inline] filemap_write_and_wait_range+0xa1/0x120 mm/filemap.c:667 ext4_punch_hole+0x1c2/0x12a0 fs/ext4/inode.c:4087 ext4_fallocate+0x1185/0x4470 fs/ext4/extents.c:4707 vfs_fallocate+0x48b/0xe40 fs/open.c:324 madvise_remove mm/madvise.c:1001 [inline] madvise_vma_behavior+0xa41/0x20c0 mm/madvise.c:1025 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1260 do_madvise.part.0+0x24a/0x340 mm/madvise.c:1439 do_madvise mm/madvise.c:1452 [inline] __do_sys_madvise mm/madvise.c:1452 [inline] __se_sys_madvise mm/madvise.c:1450 [inline] __x64_sys_madvise+0x117/0x150 mm/madvise.c:1450 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801eef08c0 which belongs to the cache sgpool-8 of size 256 The buggy address is located 0 bytes inside of freed 256-byte region [ffff88801eef08c0, ffff88801eef09c0) The buggy address belongs to the physical page: page:ffffea00007bbc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801eef0640 pfn:0x1eef0 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff8880179e7500 ffffea0000a9f050 ffffea0000a36f90 raw: ffff88801eef0640 00000000000c0000 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 0x192820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7162, tgid 7159 (syz-executor.2), ts 435173289662, free_ts 429845606073 prep_new_page mm/page_alloc.c:2552 [inline] get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4339 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5605 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x28e/0x380 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x30a/0x320 mm/slub.c:3476 mempool_alloc+0x158/0x360 mm/mempool.c:398 __sg_alloc_table+0x248/0x380 lib/scatterlist.c:318 sg_alloc_table_chained+0x9f/0x1f0 lib/sg_pool.c:133 scsi_alloc_sgtables+0x1cd/0xf70 drivers/scsi/scsi_lib.c:1040 sd_setup_read_write_cmnd drivers/scsi/sd.c:1134 [inline] sd_init_command+0x67a/0x3290 drivers/scsi/sd.c:1258 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1603 [inline] scsi_queue_rq+0x1e7b/0x3a40 drivers/scsi/scsi_lib.c:1737 blk_mq_dispatch_rq_list+0x609/0x20b0 block/blk-mq.c:2059 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:172 [inline] blk_mq_do_dispatch_sched+0x95e/0xc20 block/blk-mq-sched.c:186 __blk_mq_sched_dispatch_requests+0x26d/0x3e0 block/blk-mq-sched.c:312 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3401 [inline] free_unref_page_list+0x176/0xcd0 mm/page_alloc.c:3542 release_pages+0xcb1/0x1330 mm/swap.c:1072 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391 unmap_region+0x23d/0x2d0 mm/mmap.c:2146 do_vmi_align_munmap+0x9ca/0xf60 mm/mmap.c:2395 do_vmi_munmap+0x26e/0x2c0 mm/mmap.c:2452 mmap_region+0x1ee/0x2690 mm/mmap.c:2500 do_mmap+0x831/0xf60 mm/mmap.c:1364 vm_mmap_pgoff+0x1af/0x280 mm/util.c:542 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1410 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88801eef0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801eef0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801eef0880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88801eef0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801eef0980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================