================================================================== BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57 Read of size 8 at addr ffffaf800ccd3f70 by task syz-executor.0/2048 CPU: 0 PID: 2048 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 8: (stack is not available) Last potentially related work creation: ------------[ cut here ]------------ slab index 1411763 out of bounds (297) for stack id 41b58ab3 WARNING: CPU: 0 PID: 2048 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline] WARNING: CPU: 0 PID: 2048 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276 Modules linked in: CPU: 0 PID: 2048 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) epc : stack_depot_fetch lib/stackdepot.c:304 [inline] epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 ra : stack_depot_fetch lib/stackdepot.c:304 [inline] ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276 epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800ccd3e30 gp : ffffffff85863ac0 tp : ffffaf800c8f3080 t0 : ffffffff86bcb657 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800ccd3e40 s1 : ffffaf807a9e2b10 a0 : 000000000000003c a1 : 00000000000f0000 a2 : 0000000000000504 a3 : ffffffff8012252a a4 : 5405031e400fe800 a5 : 5405031e400fe800 a6 : 0000000000f00000 a7 : ffffaf805a9c8863 s2 : ffffaf800ccd3f70 s3 : ffffaf800744c640 s4 : ffffaf800ccd3b80 s5 : ffffaf800ccd3d58 s6 : 0000000000003fff s7 : ffffaf800ccd3f10 s8 : 0000000000400000 s9 : ffffffffffffc000 s10: ffffaf800ccd3fe0 s11: 0000000000000008 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c t5 : fffff5ef0b53910d t6 : ffffaf800ccd3938 status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003 [] describe_object_stacks mm/kasan/report.c:216 [inline] [] describe_object mm/kasan/report.c:231 [inline] [] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263 [] __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 irq event stamp: 71055 hardirqs last enabled at (71054): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (71054): [] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (71055): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (71055): [] _raw_spin_lock_irqsave+0x60/0x62 kernel/locking/spinlock.c:162 softirqs last enabled at (70924): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (70924): [] __do_softirq+0x618/0x8fc kernel/softirq.c:587 softirqs last disabled at (70935): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (70935): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (70935): [] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637 ---[ end trace 0000000000000000 ]--- The buggy address belongs to the object at ffffaf800ccd3b80 which belongs to the cache skbuff_fclone_cache of size 472 The buggy address is located 536 bytes to the right of 472-byte region [ffffaf800ccd3b80, ffffaf800ccd3d58) The buggy address belongs to the page: page:ffffaf807a9e2b10 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffaf800ccd3680 pfn:0x8ced2 head:ffffaf807a9e2b10 order:1 compound_mapcount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 ffffaf807a99b388 ffffaf807a8e1c58 ffffaf800744c640 raw: ffffaf800ccd3680 00000000000c0002 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1998, ts 316936708900, free_ts 298839292300 __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] kmem_cache_alloc_node+0x1f2/0x41c mm/slub.c:3266 __alloc_skb+0x234/0x2e4 net/core/skbuff.c:414 alloc_skb_fclone include/linux/skbuff.h:1208 [inline] tcp_stream_alloc_skb+0x70/0x4c0 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0x880/0x1d9e net/ipv4/tcp.c:1281 tcp_sendmsg+0x32/0x4e net/ipv4/tcp.c:1440 inet_sendmsg+0x74/0x94 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xa0/0xc4 net/socket.c:725 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 __slab_free+0x20a/0x29c mm/slub.c:3414 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 kmem_cache_zalloc include/linux/slab.h:705 [inline] alloc_buffer_head+0x28/0x148 fs/buffer.c:3310 alloc_page_buffers+0x2ac/0x5be fs/buffer.c:832 create_empty_buffers+0x32/0x4cc fs/buffer.c:1560 ext4_block_write_begin+0xab8/0xc4e fs/ext4/inode.c:1062 Memory state around the buggy address: ffffaf800ccd3e00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ffffaf800ccd3e80: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc >ffffaf800ccd3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffffaf800ccd3f80: fc fc fc fc fc fc fc fc f1 f1 f1 f1 00 00 00 f3 ffffaf800ccd4000: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================