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Thu, 05 Nov 2026 12:29:50 -0800 (PST) Received: from i4-l-hqh5357-03.ad.psu.edu ([130.203.139.71]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-54e27502132sm1987361cf.28.2026.11.05.12.29.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 12:29:50 -0800 (PST) From: Shuangpeng Bai To: "Md. Haris Iqbal" , Jack Wang , Jason Gunthorpe , Leon Romanovsky , Jens Axboe Cc: Shuangpeng Bai , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Subject: [BUG] RDMA/rtrs-clt: KASAN use-after-free in rtrs_clt_query Date: Thu, 5 Nov 2026 15:28:43 -0500 Message-ID: <20261105202939.3104321-1-shuangpeng.kernel@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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 rtrs_clt_query on commit: 05441d697f7f9a927264f4058cbbc6a03dfcac9d (2026-11-03) The reproducer triggers this report. It uses the supported RTRS path disconnect and RNBD force unmap_device sysfs interfaces. 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/5409f0d93ab7414fcb6d97ac799fe28f For context, I previously reported a related but distinct RTRS client use-after-free in the same subsystem: Link: https://lore.kernel.org/linux-rdma/20260921033339.1320291-1-shuangpeng.kernel@gmail.com/ I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai ================================================================== BUG: KASAN: slab-use-after-free in rtrs_clt_query (drivers/infiniband/ulp/rtrs/rtrs-clt.c:59 drivers/infiniband/ulp/rtrs/rtrs-clt.c:3140) Read of size 4 at addr ffff88810228d2f8 by task kworker/1:0/24 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 Workqueue: rtrs_client_wq rtrs_clt_reconnect_work Call Trace: dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) rtrs_clt_query (drivers/infiniband/ulp/rtrs/rtrs-clt.c:59 drivers/infiniband/ulp/rtrs/rtrs-clt.c:3140) rnbd_clt_link_ev (drivers/block/rnbd/rnbd-clt.c:691 drivers/block/rnbd/rnbd-clt.c:731) init_path (drivers/infiniband/ulp/rtrs/rtrs-clt.c:2161 drivers/infiniband/ulp/rtrs/rtrs-clt.c:2677) rtrs_clt_reconnect_work (drivers/infiniband/ulp/rtrs/rtrs-clt.c:2709) process_scheduled_works (kernel/workqueue.c:3495 kernel/workqueue.c:3578) worker_thread (kernel/workqueue.c:3659) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) Allocated by task 306 on cpu 1 at 11.590323s: kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) __kasan_kmalloc (mm/kasan/common.c:409 mm/kasan/common.c:426) alloc_path (include/linux/slab.h:991 include/linux/slab.h:1312 drivers/infiniband/ulp/rtrs/rtrs-clt.c:1540) rtrs_clt_open (drivers/infiniband/ulp/rtrs/rtrs-clt.c:2871) rnbd_clt_map_device (drivers/block/rnbd/rnbd-clt.c:1288 drivers/block/rnbd/rnbd-clt.c:1571) rnbd_clt_map_device_store (drivers/block/rnbd/rnbd-clt-sysfs.c:612) kernfs_fop_write_iter (fs/kernfs/file.c:345) vfs_write (fs/read_write.c:595 fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Freed by task 306 on cpu 1 at 47.089348s: kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) kasan_save_free_info (mm/kasan/generic.c:584) __kasan_slab_free (mm/kasan/common.c:264 mm/kasan/common.c:296) kfree (include/linux/kasan.h:235 mm/slub.c:2780 mm/slub.c:6630 mm/slub.c:6923) kobject_put (lib/kobject.c:689 lib/kobject.c:720 include/linux/kref.h:65 lib/kobject.c:737) rtrs_clt_close (drivers/infiniband/ulp/rtrs/rtrs-clt.c:2940) free_sess (drivers/block/rnbd/rnbd-clt.c:770 drivers/block/rnbd/rnbd-clt.c:786) rnbd_clt_put_dev (drivers/block/rnbd/rnbd-clt.c:49 drivers/block/rnbd/rnbd-clt.c:62) rnbd_clt_unmap_device (drivers/block/rnbd/rnbd-clt.c:1723) rnbd_clt_unmap_dev_store (drivers/block/rnbd/rnbd-clt-sysfs.c:334) kernfs_fop_write_iter (fs/kernfs/file.c:345) vfs_write (fs/read_write.c:595 fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Last potentially related work creation: kasan_save_stack (mm/kasan/common.c:57) kasan_record_aux_stack (mm/kasan/generic.c:556) insert_work (kernel/workqueue.c:2356) __queue_work (kernel/workqueue.c:2546) queue_work_on (kernel/workqueue.c:2599) rtrs_clt_close_conns (include/linux/workqueue.h:700 drivers/infiniband/ulp/rtrs/rtrs-clt.c:1963) rtrs_clt_disconnect_store (drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c:259) kernfs_fop_write_iter (fs/kernfs/file.c:345) vfs_write (fs/read_write.c:595 fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) The buggy address belongs to the object at ffff88810228d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 760 bytes inside of freed 2048-byte region [ffff88810228d000, ffff88810228d800) Best, Shuangpeng