================================================================== BUG: KASAN: use-after-free in sl_sync drivers/net/slip/slip.c:732 [inline] BUG: KASAN: use-after-free in slip_open+0x1e8/0xcb8 drivers/net/slip/slip.c:806 Read of size 4 at addr ffff00012b2760c0 by task syz-executor.0/26373 CPU: 1 PID: 26373 Comm: syz-executor.0 Not tainted 6.1.33-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350 sl_sync drivers/net/slip/slip.c:732 [inline] slip_open+0x1e8/0xcb8 drivers/net/slip/slip.c:806 tty_ldisc_open drivers/tty/tty_ldisc.c:433 [inline] tty_set_ldisc+0x41c/0x73c drivers/tty/tty_ldisc.c:558 tiocsetd+0x100/0x13c drivers/tty/tty_io.c:2428 tty_ioctl+0xba0/0xd8c drivers/tty/tty_io.c:2709 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Allocated by task 26364: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0xe0/0x1d0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x84/0x1e4 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] kvzalloc include/linux/slab.h:714 [inline] alloc_netdev_mqs+0x94/0xba8 net/core/dev.c:10585 sl_alloc drivers/net/slip/slip.c:756 [inline] slip_open+0x320/0xcb8 drivers/net/slip/slip.c:817 tty_ldisc_open drivers/tty/tty_ldisc.c:433 [inline] tty_set_ldisc+0x41c/0x73c drivers/tty/tty_ldisc.c:558 tiocsetd+0x100/0x13c drivers/tty/tty_io.c:2428 tty_ioctl+0xba0/0xd8c drivers/tty/tty_io.c:2709 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Freed by task 26363: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:1007 kvfree+0x40/0x50 mm/util.c:627 netdev_freemem+0x4c/0x64 net/core/dev.c:10539 netdev_release+0x88/0xb0 net/core/net-sysfs.c:1910 device_release+0x8c/0x1ac kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:729 netdev_run_todo+0xcf0/0xe08 net/core/dev.c:10375 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147 unregister_netdev+0x17c/0x1f0 net/core/dev.c:10904 slip_close+0x13c/0x164 drivers/net/slip/slip.c:906 tty_ldisc_close drivers/tty/tty_ldisc.c:456 [inline] tty_ldisc_kill+0x1b0/0x300 drivers/tty/tty_ldisc.c:608 tty_ldisc_release+0x190/0x23c drivers/tty/tty_ldisc.c:776 tty_release_struct+0x34/0xd4 drivers/tty/tty_io.c:1689 tty_release+0xb64/0x1014 drivers/tty/tty_io.c:1860 __fput+0x30c/0x7bc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2144/0x3470 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 The buggy address belongs to the object at ffff00012b276000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 192 bytes inside of 4096-byte region [ffff00012b276000, ffff00012b277000) The buggy address belongs to the physical page: page:000000003528a3b1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16b270 head:000000003528a3b1 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d58c9b01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003228400 dead000000000003 ffff0000c0003500 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000d58c9b01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00012b275f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff00012b276000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00012b276080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00012b276100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00012b276180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================