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e9e14a558f8ab-3d5e08ed0afmr54956005ab.4.1743319281188; Sun, 30 Mar 2025 00:21:21 -0700 (PDT) Date: Sun, 30 Mar 2025 00:21:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67e8f0f1.050a0220.1547ec.0092.GAE@google.com> Subject: [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in load_firmware_cb (2) From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a2392f333575 drm/panthor: Clean up FW version information .. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=16b57804580000 kernel config: https://syzkaller.appspot.com/x/.config?x=12ccc0a681e19f95 dashboard link: https://syzkaller.appspot.com/bug?extid=db4326df1b9af04f68fc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10011de4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a0864c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/aa9dc8dca3f7/disk-a2392f33.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/96ca6097aca7/vmlinux-a2392f33.xz kernel image: https://storage.googleapis.com/syzbot-assets/78dee40677fb/Image-a2392f33.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+db4326df1b9af04f68fc@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in load_firmware_cb+0xbc/0x1638 drivers/media/tuners/xc2028.c:1372 Read of size 8 at addr ffff0000dccc7318 by task kworker/0:58/6836 CPU: 0 UID: 0 PID: 6836 Comm: kworker/0:58 Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events request_firmware_work_func Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x198/0x550 mm/kasan/report.c:521 kasan_report+0xd8/0x138 mm/kasan/report.c:634 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 load_firmware_cb+0xbc/0x1638 drivers/media/tuners/xc2028.c:1372 request_firmware_work_func+0x150/0x214 drivers/base/firmware_loader/main.c:1196 process_one_work+0x810/0x1638 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3400 kthread+0x65c/0x7b0 kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Allocated by task 6850: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x2cc/0x428 mm/slub.c:4325 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] tuner_probe+0x108/0x1798 drivers/media/v4l2-core/tuner-core.c:636 i2c_device_probe+0x700/0x9bc drivers/i2c/i2c-core-base.c:590 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x38c/0x8fc drivers/base/dd.c:658 __driver_probe_device+0x194/0x374 drivers/base/dd.c:800 driver_probe_device+0x78/0x330 drivers/base/dd.c:830 __device_attach_driver+0x2a8/0x4f4 drivers/base/dd.c:958 bus_for_each_drv+0x228/0x2bc drivers/base/bus.c:462 __device_attach+0x2b4/0x434 drivers/base/dd.c:1030 device_initial_probe+0x24/0x34 drivers/base/dd.c:1079 bus_probe_device+0x178/0x240 drivers/base/bus.c:537 device_add+0x728/0xa6c drivers/base/core.c:3666 device_register+0x28/0x38 drivers/base/core.c:3748 i2c_new_client_device+0x8d0/0xf3c drivers/i2c/i2c-core-base.c:1020 v4l2_i2c_new_subdev_board+0xb0/0x224 drivers/media/v4l2-core/v4l2-i2c.c:80 v4l2_i2c_new_subdev+0x144/0x1e4 drivers/media/v4l2-core/v4l2-i2c.c:135 em28xx_v4l2_init+0x6c8/0x28d4 drivers/media/usb/em28xx/em28xx-video.c:2617 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x810/0x1638 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3400 kthread+0x65c/0x7b0 kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Freed by task 6850: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x180/0x478 mm/slub.c:4757 tuner_remove+0x1d8/0x1f4 drivers/media/v4l2-core/tuner-core.c:789 i2c_device_remove+0x8c/0x1dc drivers/i2c/i2c-core-base.c:631 device_remove drivers/base/dd.c:567 [inline] __device_release_driver drivers/base/dd.c:1273 [inline] device_release_driver_internal+0x3e4/0x698 drivers/base/dd.c:1296 device_release_driver+0x28/0x38 drivers/base/dd.c:1319 bus_remove_device+0x314/0x3b4 drivers/base/bus.c:579 device_del+0x480/0x828 drivers/base/core.c:3855 device_unregister+0x2c/0xcc drivers/base/core.c:3896 i2c_unregister_device+0x130/0x190 drivers/i2c/i2c-core-base.c:1069 v4l2_i2c_subdev_unregister+0xa8/0xbc drivers/media/v4l2-core/v4l2-i2c.c:28 v4l2_device_unregister+0x17c/0x248 drivers/media/v4l2-core/v4l2-device.c:102 em28xx_v4l2_init+0x1300/0x28d4 drivers/media/usb/em28xx/em28xx-video.c:2898 em28xx_init_extension+0x10c/0x1b4 drivers/media/usb/em28xx/em28xx-core.c:1117 request_module_async+0x68/0x98 drivers/media/usb/em28xx/em28xx-cards.c:3457 process_one_work+0x810/0x1638 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3400 kthread+0x65c/0x7b0 kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 The buggy address belongs to the object at ffff0000dccc7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 792 bytes inside of freed 2048-byte region [ffff0000dccc7000, ffff0000dccc7800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ccc0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3733001 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dccc7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dccc7280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000dccc7300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dccc7380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dccc7400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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