================================================================== BUG: KASAN: slab-use-after-free in sl_sync drivers/net/slip/slip.c:730 [inline] BUG: KASAN: slab-use-after-free in slip_open+0x1cc/0xcb8 drivers/net/slip/slip.c:806 Read of size 1 at addr ffff0001315bad71 by task syz-executor.1/13093 CPU: 1 PID: 13093 Comm: syz-executor.1 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0x174/0x514 mm/kasan/report.c:430 kasan_report+0xd4/0x130 mm/kasan/report.c:536 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 sl_sync drivers/net/slip/slip.c:730 [inline] slip_open+0x1cc/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:2432 tty_ioctl+0xba0/0xd8c drivers/tty/tty_io.c:2713 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+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 13078: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node+0xd4/0x1c4 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x84/0x1c8 mm/util.c:603 kvmalloc include/linux/slab.h:737 [inline] kvzalloc include/linux/slab.h:745 [inline] alloc_netdev_mqs+0x94/0xc04 net/core/dev.c:10588 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:2432 tty_ioctl+0xba0/0xd8c drivers/tty/tty_io.c:2713 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+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Freed by task 13078: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:521 ____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:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x2a8/0x49c mm/slub.c:3800 kfree+0xb8/0x19c mm/slab_common.c:1019 kvfree+0x40/0x50 mm/util.c:649 netdev_freemem+0x4c/0x64 net/core/dev.c:10542 netdev_release+0x88/0xb0 net/core/net-sysfs.c:1938 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:10362 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:148 unregister_netdev+0x184/0x1f8 net/core/dev.c:10919 slip_close+0x13c/0x164 drivers/net/slip/slip.c:906 tty_ldisc_close drivers/tty/tty_ldisc.c:456 [inline] tty_set_ldisc+0x2a8/0x73c drivers/tty/tty_ldisc.c:552 tiocsetd+0x100/0x13c drivers/tty/tty_io.c:2432 tty_ioctl+0xba0/0xd8c drivers/tty/tty_io.c:2713 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+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0001315ba000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3441 bytes inside of freed 4096-byte region [ffff0001315ba000, ffff0001315bb000) The buggy address belongs to the physical page: page:0000000006a64c96 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1715b8 head:0000000006a64c96 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000dc4e6a01 anon flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c000ca80 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000dc4e6a01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0001315bac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0001315bac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0001315bad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0001315bad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0001315bae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================