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Fri, 13 Nov 2026 09:51:45 -0800 (PST) Date: Fri, 13 Nov 2026 09:51:45 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6af74e31.fe96acdb.12252b.0009.GAE@google.com> Subject: [syzbot] [net?] [usb?] memory leak in ndisc_send_rs (4) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@kernel.org, horms@kernel.org, idosch@nvidia.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 9d66f26fefac Merge tag 'vfs-7.4-rc3.fixes.2' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=136da9ea580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4361b1bb937ae1c4 dashboard link: https://syzkaller.appspot.com/bug?extid=bf62ca9997f43d2fa521 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12e9ba09580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/292d4fa72c6e/disk-9d66f26f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/78e602f24eea/vmlinux-9d66f26f.xz kernel image: https://storage.googleapis.com/syzbot-assets/802a7b846686/bzImage-9d66f26f.xz AI-generated root cause summary: In drivers/net/usb/hso.c, hso_net_start_xmit() takes ownership of an outgoing packet by stashing it in odev->skb_tx_buf when hso_get_activity() returns -EAGAIN (e.g. when the USB device is suspended, disconnected, or not configured). However, neither hso_net_close() nor hso_free_net_device() frees odev->skb_tx_buf prior to unregistering and freeing the net_device. When a packet (such as an IPv6 Router Solicitation generated during interface configuration) is queued during device disconnect or suspend, the sk_buff and its allocated head buffer are permanently leaked. full analysis: https://syzkaller.appspot.com/x/ai_root_cause?x=bf62ca9997f43d2fa521 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bf62ca9997f43d2fa521@syzkaller.appspotmail.com BUG: memory leak unreferenced object 0xffff888100e9f200 (size 240): comm "kworker/u8:2", pid 5708, jiffies 4294993435 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 f2 e9 00 81 88 ff ff ................ 00 20 bd 23 81 88 ff ff 80 31 48 02 81 88 ff ff . .#.....1H..... backtrace (crc 28f53d77): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4733 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_node_noprof+0x368/0x400 mm/slub.c:5105 __alloc_skb+0xdc/0x4e0 net/core/skbuff.c:705 alloc_skb include/linux/skbuff.h:1390 [inline] ndisc_alloc_skb+0x46/0xf0 net/ipv6/ndisc.c:421 ndisc_send_rs+0x49/0x2f0 net/ipv6/ndisc.c:708 addrconf_dad_completed+0x1f9/0x6c0 net/ipv6/addrconf.c:4422 addrconf_dad_begin net/ipv6/addrconf.c:4184 [inline] addrconf_dad_work+0x5c8/0x910 net/ipv6/addrconf.c:4289 process_one_work+0x2b7/0x5c0 kernel/workqueue.c:3495 process_scheduled_works kernel/workqueue.c:3578 [inline] worker_thread+0x255/0x4a0 kernel/workqueue.c:3659 kthread+0x150/0x1a0 kernel/kthread.c:436 ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: memory leak unreferenced object 0xffff888106538b00 (size 704): comm "kworker/u8:2", pid 5708, jiffies 4294993435 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60 00 00 00 00 08 3a ff fe 80 00 00 00 00 00 00 `.....:......... backtrace (crc 261f6968): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4733 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_node_noprof+0x368/0x400 mm/slub.c:5105 kmalloc_reserve+0xd2/0x1b0 net/core/skbuff.c:616 __alloc_skb+0x15d/0x4e0 net/core/skbuff.c:716 alloc_skb include/linux/skbuff.h:1390 [inline] ndisc_alloc_skb+0x46/0xf0 net/ipv6/ndisc.c:421 ndisc_send_rs+0x49/0x2f0 net/ipv6/ndisc.c:708 addrconf_dad_completed+0x1f9/0x6c0 net/ipv6/addrconf.c:4422 addrconf_dad_begin net/ipv6/addrconf.c:4184 [inline] addrconf_dad_work+0x5c8/0x910 net/ipv6/addrconf.c:4289 process_one_work+0x2b7/0x5c0 kernel/workqueue.c:3495 process_scheduled_works kernel/workqueue.c:3578 [inline] worker_thread+0x255/0x4a0 kernel/workqueue.c:3659 kthread+0x150/0x1a0 kernel/kthread.c:436 ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF --- 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 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