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BUG: KASAN: slab-out-of-bounds in iov_iter_revert lib/iov_iter.c:633 [inline]
BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611
Read of size 4 at addr ffff88802994b538 by task kworker/u8:7/1109

CPU: 1 UID: 0 PID: 1109 Comm: kworker/u8:7 Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
 <TASK>
 __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:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 iov_iter_revert lib/iov_iter.c:633 [inline]
 iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611
 netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]
 netfs_retry_writes+0x166d/0x1a50 fs/netfs/write_retry.c:231
 netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
 netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5807:
 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]
 ref_tracker_alloc+0x18e/0x5b0 lib/ref_tracker.c:203
 __netdev_tracker_alloc include/linux/netdevice.h:4331 [inline]
 netdev_hold include/linux/netdevice.h:4360 [inline]
 dst_init+0xda/0x580 net/core/dst.c:52
 dst_alloc+0xbb/0x1a0 net/core/dst.c:93
 rt_dst_alloc+0x35/0x3a0 net/ipv4/route.c:1638
 ip_route_input_slow+0x1671/0x3df0 net/ipv4/route.c:2409
 ip_route_input_rcu net/ipv4/route.c:2523 [inline]
 ip_route_input_noref+0x120/0x2e0 net/ipv4/route.c:2534
 ip_rcv_finish_core+0x46f/0x2290 net/ipv4/ip_input.c:364
 ip_list_rcv_finish+0x1b8/0x720 net/ipv4/ip_input.c:609
 ip_sublist_rcv net/ipv4/ip_input.c:635 [inline]
 ip_list_rcv+0x335/0x450 net/ipv4/ip_input.c:669
 __netif_receive_skb_list_ptype net/core/dev.c:5930 [inline]
 __netif_receive_skb_list_core+0x752/0x950 net/core/dev.c:5977
 __netif_receive_skb_list net/core/dev.c:6029 [inline]
 netif_receive_skb_list_internal+0x752/0xdb0 net/core/dev.c:6120
 gro_normal_list include/net/gro.h:532 [inline]
 gro_normal_list include/net/gro.h:528 [inline]
 napi_complete_done+0x23f/0x970 net/core/dev.c:6490
 virtqueue_napi_complete drivers/net/virtio_net.c:737 [inline]
 virtnet_poll+0x1cfd/0x3c00 drivers/net/virtio_net.c:3053
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7324
 napi_poll net/core/dev.c:7388 [inline]
 net_rx_action+0xa97/0x1010 net/core/dev.c:7510
 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 common_interrupt+0xbf/0xe0 arch/x86/kernel/irq.c:285
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693

The buggy address belongs to the object at ffff88802994b500
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 allocated 32-byte region [ffff88802994b500, ffff88802994b520)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2994b
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b441780 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000400040 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 8659185960, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x263/0x23a0 mm/page_alloc.c:4970
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301
 alloc_slab_page mm/slub.c:2468 [inline]
 allocate_slab mm/slub.c:2632 [inline]
 new_slab+0x244/0x340 mm/slub.c:2686
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3872
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3962
 __slab_alloc_node mm/slub.c:4037 [inline]
 slab_alloc_node mm/slub.c:4198 [inline]
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4353
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 rh_call_control drivers/usb/core/hcd.c:491 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:821 [inline]
 usb_hcd_submit_urb+0x5cf/0x1c60 drivers/usb/core/hcd.c:1529
 usb_submit_urb+0x87c/0x1730 drivers/usb/core/urb.c:581
 usb_start_wait_urb+0x104/0x4b0 drivers/usb/core/message.c:59
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x326/0x4a0 drivers/usb/core/message.c:154
 usb_get_descriptor+0xbb/0x1b0 drivers/usb/core/message.c:794
 usb_get_configuration+0x3ba/0x6510 drivers/usb/core/config.c:976
 usb_enumerate_device drivers/usb/core/hub.c:2495 [inline]
 usb_new_device+0x11ac/0x1a20 drivers/usb/core/hub.c:2633
 register_root_hub+0x299/0x730 drivers/usb/core/hcd.c:994
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802994b400: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
 ffff88802994b480: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff88802994b500: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
                                        ^
 ffff88802994b580: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff88802994b600: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
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