================================================================== 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 ffff888083f9dd80 by task syz-executor.4/26373 CPU: 1 PID: 26373 Comm: syz-executor.4 Not tainted 6.2.0-rc7-next-20230208-syzkaller #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+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: 0033:0x7f16d6c8c0f9 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:00007f16d798a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f16d6dac120 RCX: 00007f16d6c8c0f9 RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000007 RBP: 00007f16d6ce7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001dd00 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc2ab69a9f R14: 00007f16d798a300 R15: 0000000000022000 Allocated by task 26367: 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 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140 getname_flags+0x9e/0xe0 include/linux/audit.h:321 getname fs/namei.c:219 [inline] __do_sys_symlinkat fs/namei.c:4440 [inline] __se_sys_symlinkat fs/namei.c:4437 [inline] __x64_sys_symlinkat+0x8a/0xc0 fs/namei.c:4437 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 Freed by task 26367: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free+0xec/0x4e0 mm/slub.c:3809 putname fs/namei.c:272 [inline] putname+0x102/0x140 fs/namei.c:258 do_symlinkat+0x19c/0x2e0 fs/namei.c:4433 __do_sys_symlinkat fs/namei.c:4440 [inline] __se_sys_symlinkat fs/namei.c:4437 [inline] __x64_sys_symlinkat+0x97/0xc0 fs/namei.c:4437 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 ffff888083f9d500 which belongs to the cache names_cache of size 4096 The buggy address is located 2176 bytes inside of freed 4096-byte region [ffff888083f9d500, ffff888083f9e500) The buggy address belongs to the physical page: page:ffffea00020fe600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x83f98 head:ffffea00020fe600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888140008640 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 26367, tgid 26367 (syz-executor.2), ts 2810657820191, free_ts 2806318031435 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 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140 getname_flags include/linux/audit.h:321 [inline] getname+0x92/0xd0 fs/namei.c:219 do_sys_openat2+0xf5/0x4c0 fs/open.c:1306 do_sys_open fs/open.c:1328 [inline] __do_sys_openat fs/open.c:1344 [inline] __se_sys_openat fs/open.c:1339 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1339 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 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+0x1d/0x490 mm/page_alloc.c:3496 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 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 kmem_cache_zalloc include/linux/slab.h:710 [inline] taskstats_tgid_alloc kernel/taskstats.c:583 [inline] taskstats_exit+0x5f3/0xb80 kernel/taskstats.c:622 do_exit+0x84e/0x2b60 kernel/exit.c:854 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019 get_signal+0x2321/0x25b0 kernel/signal.c:2859 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888083f9dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888083f9dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888083f9dd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888083f9de00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888083f9de80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================