================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline] BUG: KASAN: slab-use-after-free in ucma_get_mc drivers/infiniband/core/ucma.c:263 [inline] BUG: KASAN: slab-use-after-free in ucma_create_uevent+0x8d1/0xd70 drivers/infiniband/core/ucma.c:287 Write of size 4 at addr ffff88802a9566b0 by task kworker/u32:5/1140 CPU: 2 UID: 0 PID: 1140 Comm: kworker/u32:5 Not tainted 6.16.0-rc7-syzkaller-g5f33ebd2018c-dirty #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: rdma_cm cma_iboe_join_work_handler Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_inc_not_zero include/linux/atomic/atomic-instrumented.h:1536 [inline] ucma_get_mc drivers/infiniband/core/ucma.c:263 [inline] ucma_create_uevent+0x8d1/0xd70 drivers/infiniband/core/ucma.c:287 ucma_event_handler+0x102/0x940 drivers/infiniband/core/ucma.c:366 cma_cm_event_handler+0x97/0x300 drivers/infiniband/core/cma.c:2173 cma_iboe_join_work_handler+0xca/0x170 drivers/infiniband/core/cma.c:3008 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 6548: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] ucma_process_join+0x233/0xb90 drivers/infiniband/core/ucma.c:1480 ucma_join_multicast+0xe8/0x160 drivers/infiniband/core/ucma.c:1575 ucma_write+0x1fb/0x330 drivers/infiniband/core/ucma.c:1756 vfs_write+0x29d/0x1150 fs/read_write.c:684 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6548: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4842 ucma_put_mc drivers/infiniband/core/ucma.c:269 [inline] ucma_put_mc drivers/infiniband/core/ucma.c:266 [inline] ucma_process_join+0x763/0xb90 drivers/infiniband/core/ucma.c:1534 ucma_join_multicast+0xe8/0x160 drivers/infiniband/core/ucma.c:1575 ucma_write+0x1fb/0x330 drivers/infiniband/core/ucma.c:1756 vfs_write+0x29d/0x1150 fs/read_write.c:684 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802a956600 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 176 bytes inside of freed 192-byte region [ffff88802a956600, ffff88802a9566c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a956 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b8423c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000000f5000000 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 6445, tgid 6445 (syz-executor), ts 92358145050, free_ts 92277395639 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_slab_page mm/slub.c:2453 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x94/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_node_noprof+0x2ed/0x500 mm/slub.c:4334 kmalloc_array_node_noprof include/linux/slab.h:1020 [inline] alloc_slab_obj_exts+0x41/0xa0 mm/slub.c:1992 account_slab mm/slub.c:2578 [inline] allocate_slab mm/slub.c:2638 [inline] new_slab+0x283/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] kmem_cache_alloc_lru_noprof+0xf4/0x3b0 mm/slub.c:4216 sock_alloc_inode+0x25/0x1c0 net/socket.c:309 alloc_inode+0x61/0x240 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:3364 [inline] sock_alloc+0x40/0x280 net/socket.c:622 __sock_create+0xc1/0x8d0 net/socket.c:1505 page last free pid 23 tgid 23 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 pagetable_free include/linux/mm.h:2884 [inline] pagetable_dtor_free include/linux/mm.h:2982 [inline] __tlb_remove_table include/asm-generic/tlb.h:220 [inline] __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x116/0x1a0 mm/mmu_gather.c:290 rcu_do_batch kernel/rcu/tree.c:2576 [inline] rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2832 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 run_ksoftirqd kernel/softirq.c:968 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960 smpboot_thread_fn+0x3f4/0xae0 kernel/smpboot.c:164 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88802a956580: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff88802a956600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802a956680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88802a956700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802a956780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================