================================================================== BUG: KASAN: use-after-free in gphonet_set_gadget drivers/usb/gadget/function/f_phonet.c:720 [inline] BUG: KASAN: use-after-free in pn_bind+0x100/0x9c0 drivers/usb/gadget/function/f_phonet.c:510 Write of size 8 at addr ffff0000f29ce6c0 by task syz.1.372/6146 CPU: 0 PID: 6146 Comm: syz.1.372 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_store8_noabort+0x2c/0x38 mm/kasan/report_generic.c:356 gphonet_set_gadget drivers/usb/gadget/function/f_phonet.c:720 [inline] pn_bind+0x100/0x9c0 drivers/usb/gadget/function/f_phonet.c:510 usb_add_function+0x234/0x7a8 drivers/usb/gadget/composite.c:337 configfs_composite_bind+0x7e0/0xce4 drivers/usb/gadget/configfs.c:1409 gadget_bind_driver+0x26c/0x684 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __driver_attach+0x3bc/0x614 drivers/base/dd.c:1220 bus_for_each_dev+0x148/0x1d0 drivers/base/bus.c:303 driver_attach+0x50/0x60 drivers/base/dd.c:1237 bus_add_driver+0x2c0/0x518 drivers/base/bus.c:620 driver_register+0x200/0x37c drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1730 gadget_dev_desc_UDC_store+0x168/0x268 drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x260/0x338 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585 Allocated by task 4814: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xdc/0x184 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x88/0x1d4 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x1d8/0xc24 fs/seq_file.c:210 kernfs_fop_read_iter+0x13c/0x5d8 fs/kernfs/file.c:297 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x3cc/0x7b8 fs/read_write.c:470 ksys_read+0x12c/0x228 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585 The buggy address belongs to the object at ffff0000f29ce000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 1728 bytes inside of 4096-byte region [ffff0000f29ce000, ffff0000f29cf000) The buggy address belongs to the physical page: page:00000000e50055bb refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f29cc000 pfn:0x1329c8 head:00000000e50055bb order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000df8b1b01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003d39208 fffffc0003d04408 ffff0000c0003500 raw: ffff0000f29cc000 0000000000040002 00000001ffffffff ffff0000df8b1b01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f29ce580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f29ce600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f29ce680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f29ce700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f29ce780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ kernel BUG at net/core/dev.c:10149! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 6146 Comm: syz.1.372 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : register_netdevice+0x1624/0x1650 net/core/dev.c:10149 lr : register_netdevice+0x1624/0x1650 net/core/dev.c:10149 sp : ffff8000211e7400 x29: ffff8000211e74d0 x28: dfff800000000000 x27: ffff0000d28c60d8 x26: ffff8000211e7460 x25: ffff0000f29ce000 x24: ffff70000423ce8c x23: 0000000000000000 x22: dfff800000000000 x21: 1fffe0001e539cc7 x20: 0000000000000000 x19: ffff0000f29ce000 x18: 1fffe00033e7277e x17: 0000000000000000 x16: ffff800011b90540 x15: 0000000000000002 x14: 0000000000000001 x13: 1ffff00002f409bc x12: 0000000000080000 x11: 0000000000024630 x10: ffff80002292b000 x9 : ffff80000ff14040 x8 : 0000000000024631 x7 : 0000000000000000 x6 : ffff80000ff4aac8 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80000ff13d40 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: register_netdevice+0x1624/0x1650 net/core/dev.c:10149 register_netdev+0x48/0x64 net/core/dev.c:10371 gphonet_register_netdev drivers/usb/gadget/function/f_phonet.c:727 [inline] pn_bind+0x110/0x9c0 drivers/usb/gadget/function/f_phonet.c:511 usb_add_function+0x234/0x7a8 drivers/usb/gadget/composite.c:337 configfs_composite_bind+0x7e0/0xce4 drivers/usb/gadget/configfs.c:1409 gadget_bind_driver+0x26c/0x684 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __driver_attach+0x3bc/0x614 drivers/base/dd.c:1220 bus_for_each_dev+0x148/0x1d0 drivers/base/bus.c:303 driver_attach+0x50/0x60 drivers/base/dd.c:1237 bus_add_driver+0x2c0/0x518 drivers/base/bus.c:620 driver_register+0x200/0x37c drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1730 gadget_dev_desc_UDC_store+0x168/0x268 drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x260/0x338 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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:585 Code: d4210000 96167c0b d4210000 96167c09 (d4210000) ---[ end trace 0000000000000000 ]---