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Sun, 14 Jun 2026 18:20:50 -0700 (PDT) Received: from localhost.localdomain ([2601:985:4601:5df0:2106:6ce9:6b1:8f70]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-517fb854290sm91326681cf.31.2026.06.14.18.20.49 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 14 Jun 2026 18:20:49 -0700 (PDT) From: Shuangpeng Bai To: pali@kernel.org, hansg@kernel.org, ilpo.jarvinen@linux.intel.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUG] KASAN: slab-use-after-free in smo8800_misc_release Date: Sun, 14 Jun 2026 21:20:48 -0400 Message-ID: <178144969601.60470.2802762361760676957@gmail.com> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Kernel Maintainers, I hit the following report while testing current upstream kernel: KASAN: slab-use-after-free in smo8800_misc_release I reproduced this on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026) The reproducer and .config files are here. https://gist.github.com/shuangpengbai/0e7f7e0272ec4df28a7070a6e757b03b I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai [ 54.037363][ T8372] BUG: KASAN: slab-use-after-free in smo8800_misc_release (include/linux/instrumented.h:97 include/asm-generic/bitops/instrumented-atomic.h:41 drivers/platform/x86/dell/dell-smo8800.c:95) [ 54.039643][ T8372] Write of size 8 at addr ffff888120aa1c90 by task smo8800_oldfd_r/8372 [ 54.042358][ T8372] 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 [ 54.042364][ T8372] Call Trace: [ 54.042373][ T8372] [ 54.042379][ T8372] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 54.042393][ T8372] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) [ 54.042436][ T8372] kasan_report (mm/kasan/report.c:595) [ 54.042454][ T8372] kasan_check_range (mm/kasan/generic.c:? mm/kasan/generic.c:200) [ 54.042463][ T8372] smo8800_misc_release (include/linux/instrumented.h:97 include/asm-generic/bitops/instrumented-atomic.h:41 drivers/platform/x86/dell/dell-smo8800.c:95) [ 54.042471][ T8372] __fput (fs/file_table.c:510) [ 54.042487][ T8372] fput_close_sync (fs/file_table.c:615) [ 54.042523][ T8372] __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492) [ 54.042534][ T8372] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 54.042549][ T8372] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 54.042621][ T8372] [ 54.064208][ T8372] Freed by task 8372 on cpu 0 at 53.931664s: [ 54.064831][ T8372] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 54.065319][ T8372] kasan_save_free_info (mm/kasan/generic.c:584) [ 54.065842][ T8372] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) [ 54.066340][ T8372] kfree (include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566) [ 54.066752][ T8372] devres_release_all (drivers/base/devres.c:50 drivers/base/devres.c:547 drivers/base/devres.c:576) [ 54.067280][ T8372] device_release_driver_internal (drivers/base/dd.c:598 drivers/base/dd.c:1357 drivers/base/dd.c:1375) [ 54.067908][ T8372] unbind_store (drivers/base/bus.c:244) [ 54.068376][ T8372] kernfs_fop_write_iter (fs/kernfs/file.c:352) [ 54.068920][ T8372] vfs_write (fs/read_write.c:595 fs/read_write.c:688) [ 54.069355][ T8372] ksys_write (fs/read_write.c:740) [ 54.069803][ T8372] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 54.070280][ T8372] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 54.071132][ T8372] The buggy address belongs to the object at ffff888120aa1c00 [ 54.071132][ T8372] which belongs to the cache kmalloc-192 of size 192 [ 54.072546][ T8372] The buggy address is located 144 bytes inside of [ 54.072546][ T8372] freed 192-byte region [ffff888120aa1c00, ffff888120aa1cc0) Best, Shuangpeng