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Tue, 18 Aug 2026 22:00:43 -0700 (PDT) Received: from i4-l-hqh5357-03.ad.psu.edu ([130.203.139.71]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-90c5f2a386fsm6042596d6.33.2026.08.18.22.00.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Aug 2026 22:00:43 -0700 (PDT) From: Shuangpeng Bai To: David Heidelberg Cc: Shuangpeng Bai , davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, oe-linux-nfc@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUG] NFC: slab-use-after-free in _raw_spin_lock_irqsave Date: Wed, 19 Aug 2026 01:00:29 -0400 Message-ID: <20260819050031.2725592-1-shuangpeng.kernel@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Kernel Maintainers, I hit the following report while testing current upstream kernel: KASAN: slab-use-after-free in _raw_spin_lock_irqsave on commit: 3aa1dcaa4f6f5ae08936491e08bd456f331f2d40 (2026-08-13) To help trigger the bug more reliably, we applied a minimal diagnostic patch that only adds delays and print statements. The reproducer and .config files are here. https://gist.github.com/shuangpengbai/f7dab4725e2a2d57b1d302714c93c549 I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai [ 46.711115][ T9] ================================================================== [ 46.711848][ T9] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:1300 ./include/asm-generic/qspinlock.h:111 ./include/linux/spinlock.h:187 ./include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:166) [ 46.712620][ T9] Write of size 4 at addr ffff88811da9cb94 by task kworker/0:0/9 [ 46.713329][ T9] [ 46.713560][ T9] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 46.713563][ T9] Workqueue: events nfc_llcp_tx_work [ 46.713570][ T9] Call Trace: [ 46.713573][ T9] [ 46.713574][ T9] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 46.713580][ T9] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) [ 46.713598][ T9] kasan_report (mm/kasan/report.c:595) [ 46.713606][ T9] kasan_check_range (mm/kasan/generic.c:? mm/kasan/generic.c:200) [ 46.713609][ T9] _raw_spin_lock_irqsave (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:1300 ./include/asm-generic/qspinlock.h:111 ./include/linux/spinlock.h:187 ./include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:166) [ 46.713621][ T9] skb_queue_tail (net/core/skbuff.c:4114) [ 46.713627][ T9] nfc_llcp_tx_work (net/nfc/llcp_core.c:848) [ 46.713631][ T9] process_scheduled_works (kernel/workqueue.c:3322 kernel/workqueue.c:3405) [ 46.713637][ T9] worker_thread (kernel/workqueue.c:3486) [ 46.713642][ T9] kthread (kernel/kthread.c:436) [ 46.713654][ T9] ret_from_fork (archkernel/process.c:158) [ 46.713669][ T9] ret_from_fork_asm (arch/x86/entry/entry_64.S:245) [ 46.713673][ T9] [ 46.713675][ T9] [ 46.728016][ T9] Allocated by task 8236 on cpu 0 at 46.562534s: [ 46.728599][ T9] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 46.729032][ T9] __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415) [ 46.729460][ T9] __kmalloc_noprof (./include/linux/kasan.h:263 mm/slub.c:5334 mm/slub.c:5359) [ 46.729908][ T9] sk_prot_alloc (./include/linux/slab.h:992 net/core/sock.c:2251) [ 46.730337][ T9] sk_alloc (net/core/sock.c:2307) [ 46.730711][ T9] llcp_sock_create (net/nfc/llcp_sock.c:1004 net/nfc/llcp_sock.c:1069) [ 46.731154][ T9] nfc_sock_create (net/nfc/af_nfc.c:31) [ 46.731587][ T9] __sock_create (net/socket.c:1651) [ 46.732010][ T9] __sys_socket (net/socket.c:1709 net/socket.c:1746 net/socket.c:1793) [ 46.732424][ T9] __x64_sys_socket (net/socket.c:1807 net/socket.c:1805 net/socket.c:1805) [ 46.732853][ T9] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 46.733274][ T9] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 46.733815][ T9] [ 46.734038][ T9] Freed by task 8236 on cpu 0 at 46.686415s: [ 46.734594][ T9] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 46.735024][ T9] kasan_save_free_info (mm/kasan/generic.c:584) [ 46.735493][ T9] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) [ 46.735945][ T9] kfree (./include/linux/kasan.h:235 mm/slub.c:2677 mm/slub.c:6377 mm/slub.c:6692) [ 46.736307][ T9] __sk_destruct (net/core/sock.c:2290 net/core/sock.c:2390) [ 46.736732][ T9] llcp_sock_release (.net/sock.h:2020 net/nfc/llcp_sock.c:664) [ 46.737189][ T9] sock_close (net/socket.c:710 net/socket.c:1501) [ 46.737580][ T9] __fput (fs/file_table.c:512) [ 46.737946][ T9] fput_close_sync (fs/file_table.c:617) [ 46.738388][ T9] __x64_sys_close (fs/open.c:1511 fs/open.c:1496 fs/open.c:1496) [ 46.738811][ T9] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 46.739230][ T9] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 46.739771][ T9] [ 46.739991][ T9] The buggy address belongs to the object at ffff88811da9c800 [ 46.739991][ T9] which belongs to the cache kmalloc-1k of size 1024 [ 46.741271][ T9] The buggy address is located 916 bytes inside of [ 46.741271][ T9] freed 1024-byte region [ffff88811da9c800, ffff88811da9cc00) [ 46.742518][ T9] [ 46.742742][ T9] The buggy address belongs to the physical page: Best, Shuangpeng