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mxl111sf_get_stream_config_atsc_mh From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c03c1a14507d Linux 7.3 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1168a305580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c4b098695335c89f dashboard link: https://syzkaller.appspot.com/bug?extid=ffac2da5e6f8ad2671b2 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127cc081580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ffac2da5e6f8ad2671b2@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc00000000a1: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000508-0x000000000000050f] CPU: 1 UID: 0 PID: 5937 Comm: syz-executor260 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:mxl111sf_get_stream_config_atsc_mh+0x3e/0x9d0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:1193 Code: 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 0a 54 92 f9 0f 1f 44 00 00 e8 00 54 92 f9 49 81 c7 08 05 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 e7 03 00 00 45 8b 3f 4c 89 ff 48 c7 c6 RSP: 0018:ffffc9000345fb28 EFLAGS: 00010202 RAX: 00000000000000a1 RBX: ffffc9000345fbc0 RCX: ffff888077398000 RDX: 0000000000000000 RSI: ffff888058feca19 RDI: 0000000000000000 RBP: ffffc9000345fc38 R08: 0000001800060502 R09: 0000000100000c00 R10: 0000001800060502 R11: ffffffff8835bdd0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff888058feca19 R15: 0000000000000508 FS: 00007f554a6f06c0(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc031d500f5 CR3: 0000000034892000 CR4: 00000000003526f0 Call Trace: dvb_usb_start_feed+0x361/0xc70 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:271 dmx_ts_feed_start_filtering+0x129/0x220 drivers/media/dvb-core/dvb_demux.c:747 dvb_dmxdev_start_feed drivers/media/dvb-core/dmxdev.c:658 [inline] dvb_dmxdev_filter_start+0x434/0x10d0 drivers/media/dvb-core/dmxdev.c:769 dvb_demux_do_ioctl+0x48b/0x540 drivers/media/dvb-core/dmxdev.c:1099 dvb_usercopy+0x199/0x2e0 drivers/media/dvb-core/dvbdev.c:996 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1208 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f554a728c1b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007f554a6efe30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007f554a728c1b RDX: 00007f554a6efe90 RSI: 0000000040146f2c RDI: 0000000000000008 RBP: 00007f554a796625 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f554a79644d R13: 00007f554a7c1598 R14: 00007f5540000b70 R15: 00007f554a7c15b0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mxl111sf_get_stream_config_atsc_mh+0x3e/0x9d0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:1193 Code: 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 0a 54 92 f9 0f 1f 44 00 00 e8 00 54 92 f9 49 81 c7 08 05 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 e7 03 00 00 45 8b 3f 4c 89 ff 48 c7 c6 RSP: 0018:ffffc9000345fb28 EFLAGS: 00010202 RAX: 00000000000000a1 RBX: ffffc9000345fbc0 RCX: ffff888077398000 RDX: 0000000000000000 RSI: ffff888058feca19 RDI: 0000000000000000 RBP: ffffc9000345fc38 R08: 0000001800060502 R09: 0000000100000c00 R10: 0000001800060502 R11: ffffffff8835bdd0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff888058feca19 R15: 0000000000000508 FS: 00007f554a6f06c0(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc031d500f5 CR3: 0000000034892000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 49 89 ff mov %rdi,%r15 3: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 a: fc ff df d: e8 0a 54 92 f9 call 0xf992541c 12: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 17: e8 00 54 92 f9 call 0xf992541c 1c: 49 81 c7 08 05 00 00 add $0x508,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 e7 03 00 00 jne 0x41e 37: 45 8b 3f mov (%r15),%r15d 3a: 4c 89 ff mov %r15,%rdi 3d: 48 rex.W 3e: c7 .byte 0xc7 3f: c6 .byte 0xc6 --- 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