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Sun, 14 Jun 2026 12:23:33 -0700 (PDT) Received: from localhost.localdomain ([2607:fb90:a8d1:8eec:5c3c:2f7e:d7e3:b1bd]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9161a03d6fcsm808174085a.35.2026.06.14.12.23.32 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 14 Jun 2026 12:23:33 -0700 (PDT) From: Shuangpeng Bai To: kees@kernel.org, linux-kernel@vger.kernel.org Subject: [BUG] KASAN: slab-use-after-free in firmware_map_add_hotplug Date: Sun, 14 Jun 2026 15:23:32 -0400 Message-ID: <178144969601.60470.9522872141936607083@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 firmware_map_add_hotplug on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026) The reproducer and .config files are here. https://gist.github.com/shuangpengbai/05186849a5f624d676dc87d1aada1ebb I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai [ 260.257996][ T8288] BUG: KASAN: slab-use-after-free in firmware_map_add_hotplug (drivers/firmware/memmap.c:225 drivers/firmware/memmap.c:248 drivers/firmware/memmap.c:286) [ 260.258917][ T8288] Read of size 8 at addr ffff8881164bca00 by task bash/8288 [ 260.259645][ T8288] [ 260.259920][ T8288] 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 [ 260.259923][ T8288] Call Trace: [ 260.259926][ T8288] [ 260.259929][ T8288] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 260.259935][ T8288] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) [ 260.259953][ T8288] kasan_report (mm/kasan/report.c:595) [ 260.259963][ T8288] firmware_map_add_hotplug (drivers/firmware/memmap.c:225 drivers/firmware/memmap.c:248 drivers/firmware/memmap.c:286) [ 260.259968][ T8288] add_memory_resource (mm/memory_hotplug.c:1569) [ 260.260013][ T8288] __add_memory (mm/memory_hotplug.c:1609) [ 260.260017][ T8288] probe_store (drivers/base/memory.c:582) [ 260.260039][ T8288] kernfs_fop_write_iter (fs/kernfs/file.c:352) [ 260.260044][ T8288] vfs_write (fs/read_write.c:595 fs/read_write.c:688) [ 260.260071][ T8288] ksys_write (fs/read_write.c:740) [ 260.260081][ T8288] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 260.260087][ T8288] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 260.260091][ T8288] RIP: 0033:0x7fa5761be473 [ 260.260096][ T8288] Code: 8b 15 21 2a 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18 [ 260.260100][ T8288] RSP: 002b:00007ffd2ca767d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 260.260106][ T8288] RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007fa5761be473 [ 260.260110][ T8288] RDX: 000000000000000b RSI: 000056533b27a5d0 RDI: 0000000000000001 [ 260.260113][ T8288] RBP: 000056533b27a5d0 R08: 00007fa576262040 R09: 00007fa5762620c0 [ 260.260115][ T8288] R10: 00007fa576261fc0 R11: 0000000000000246 R12: 000000000000000b [ 260.260118][ T8288] R13: 00007fa5762a26a0 R14: 000000000000000b R15: 00007fa57629d880 [ 260.260124][ T8288] [ 260.260126][ T8288] [ 260.281956][ T8288] Freed by task 8288 on cpu 1 at 260.173806s: [ 260.282369][ T8288] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 260.282774][ T8288] kasan_save_free_info (mm/kasan/generic.c:584) [ 260.283119][ T8288] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) [ 260.283451][ T8288] kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566) [ 260.283722][ T8288] kobject_put (lib/kobject.c:689 lib/kobject.c:720 ./include/linux/kref.h:65 lib/kobject.c:737) [ 260.284025][ T8288] firmware_map_add_hotplug (drivers/firmware/memmap.c:192 drivers/firmware/memmap.c:306) [ 260.284404][ T8288] add_memory_resource (mm/memory_hotplug.c:1569) [ 260.284758][ T8288] __add_memory (mm/memory_hotplug.c:1609) [ 260.285054][ T8288] probe_store (drivers/base/memory.c:582) [ 260.285371][ T8288] kernfs_fop_write_iter (fs/kernfs/file.c:352) [ 260.285733][ T8288] vfs_write (fs/read_write.c:595 fs/read_write.c:688) [ 260.286026][ T8288] ksys_write (fs/read_write.c:740) [ 260.286327][ T8288] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 260.286644][ T8288] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 260.287054][ T8288] [ 260.287220][ T8288] The buggy address belongs to the object at ffff8881164bca00 [ 260.287220][ T8288] which belongs to the cache kmalloc-128 of size 128 [ 260.288174][ T8288] The buggy address is located 0 bytes inside of [ 260.288174][ T8288] freed 128-byte region [ffff8881164bca00, ffff8881164bca80) [ 260.289086][ T8288] [ 260.289251][ T8288] The buggy address belongs to the physical page: [ 260.289690][ T8288] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1164bc [ 260.290298][ T8288] flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff) [ 260.290809][ T8288] page_type: f5(slab) [ 260.291086][ T8288] raw: 017ff00000000000 ffff888100041a00 dead000000000122 0000000000000000 [ 260.291676][ T8288] raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 [ 260.292270][ T8288] page dumped because: kasan: bad access detected [ 260.292726][ T8288] page_owner tracks the page as allocated [ 260.293302][ T8288] page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8288, tgid 8288 (bash), ts 260132581045, free_ts 260130593098 Best, Shuangpeng