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2002:a05:6820:83c6:10b0:6b1:4b76:1c18 with SMTP id 006d021491bc7-6b159461f6emr3510570eaf.24.1787298751690; Fri, 21 Aug 2026 00:52:31 -0700 (PDT) Date: Fri, 21 Aug 2026 00:52:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8803bf.dbb3a75c.13dd47.0009.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in gether_get_ifname From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 21d6ac051080 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=163ad6c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3 dashboard link: https://syzkaller.appspot.com/bug?extid=3a0d6aa450317f25e501 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cbfa79580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1182d949580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/88380e2ddcb9/disk-21d6ac05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5dba5c2896b7/vmlinux-21d6ac05.xz kernel image: https://storage.googleapis.com/syzbot-assets/52ac739e37e0/Image-21d6ac05.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3a0d6aa450317f25e501@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in gether_get_ifname+0x104/0x124 drivers/usb/gadget/function/u_ether.c:1033 Read of size 1 at addr ffff0000d09b5042 by task syz.0.17/4928 CPU: 1 UID: 0 PID: 4928 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 gether_get_ifname+0x104/0x124 drivers/usb/gadget/function/u_ether.c:1033 f_phonet_ifname_show+0x4c/0x60 drivers/usb/gadget/function/f_phonet.c:603 fill_read_buffer fs/configfs/file.c:68 [inline] configfs_read_iter+0x234/0x508 fs/configfs/file.c:88 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x498/0x8c8 fs/read_write.c:574 ksys_read+0x12c/0x228 fs/read_write.c:716 __do_sys_read fs/read_write.c:725 [inline] __se_sys_read fs/read_write.c:723 [inline] __arm64_sys_read+0x84/0x98 fs/read_write.c:723 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Allocated by task 4928: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kvmalloc_node_noprof+0x460/0x7d8 mm/slub.c:6905 alloc_netdev_mqs+0xac/0xf2c net/core/dev.c:12055 gphonet_setup_default+0x38/0x88 drivers/usb/gadget/function/f_phonet.c:706 phonet_alloc_inst+0x84/0x100 drivers/usb/gadget/function/f_phonet.c:640 try_get_usb_function_instance+0xe4/0x164 drivers/usb/gadget/functions.c:28 usb_get_function_instance+0x24/0xb0 drivers/usb/gadget/functions.c:44 function_make+0x110/0x300 drivers/usb/gadget/configfs.c:626 configfs_mkdir+0x374/0x7d4 fs/configfs/dir.c:1360 vfs_mkdir+0x2dc/0x464 fs/namei.c:5276 filename_mkdirat+0x228/0x3f4 fs/namei.c:5309 __do_sys_mkdirat fs/namei.c:5330 [inline] __se_sys_mkdirat fs/namei.c:5327 [inline] __arm64_sys_mkdirat+0x9c/0xc0 fs/namei.c:5327 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 The buggy address belongs to the object at ffff0000d09b4000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 314 bytes to the right of allocated 3848-byte region [ffff0000d09b4000, ffff0000d09b4f08) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1109b0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000cb462741 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c000b500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800040004 00000000f5000000 ffff0000cb462741 head: 05ffc00000000040 ffff0000c000b500 dead000000000100 dead000000000122 head: 0000000000000000 0000000800040004 00000000f5000000 ffff0000cb462741 head: 05ffc00000000003 fffffdffc3426c01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d09b4f00: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d09b4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d09b5000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d09b5080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d09b5100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup