================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf8023cdffc0 by task syz-executor.0/2768 CPU: 0 PID: 2768 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 [] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146 [] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffffaf8023cdf800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 960 bytes to the right of 1024-byte region [ffffaf8023cdf800, ffffaf8023cdfc00) The buggy address belongs to the page: page:ffffaf807b05acc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa3ed8 head:ffffaf807b05acc0 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xa000010200(slab|head|section=20|node=0|zone=0) raw: 000000a000010200 0000000000000000 0000000000000001 ffffaf8007201dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2053, ts 1358481966100, free_ts 1356589678700 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x25a/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] __kmalloc_node_track_caller+0x26c/0x362 mm/slub.c:4957 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xee/0x2e4 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1158 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_fib+0x108/0x2be net/ipv4/fib_semantics.c:518 fib_table_insert+0x52a/0xebe net/ipv4/fib_trie.c:1389 fib_magic+0x3f4/0x438 net/ipv4/fib_frontend.c:1087 fib_add_ifaddr+0x1fc/0x2e2 net/ipv4/fib_frontend.c:1122 fib_netdev_event+0x362/0x4b0 net/ipv4/fib_frontend.c:1466 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 __free_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __unfreeze_partials+0x16a/0x18e mm/slub.c:2536 put_cpu_partial+0xf6/0x162 mm/slub.c:2612 __slab_free+0x166/0x29c mm/slub.c:3378 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x338/0x3de mm/slub.c:3243 vm_area_alloc+0x2e/0xaa kernel/fork.c:349 mmap_region+0x62e/0xa88 mm/mmap.c:1773 Memory state around the buggy address: ffffaf8023cdfe80: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 ffffaf8023cdff00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf8023cdff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf8023ce0000: 00 00 00 00 f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 ffffaf8023ce0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================