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02:23:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac21b16.34119e79.2f92f3.0020.GAE@google.com> Subject: [syzbot] [media?] general protection fault in friio_streaming_ctrl 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: ce1e0223d8ad Merge tag 'devicetree-fixes-for-7.3-2' of git.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=175307f5580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9d4242cb1c54cdf7 dashboard link: https://syzkaller.appspot.com/bug?extid=ac020fbb657e00356ca2 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10020ec9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ac020fbb657e00356ca2@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000061: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000308-0x000000000000030f] CPU: 0 UID: 0 PID: 5921 Comm: syz-executor133 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:friio_streaming_ctrl+0x43/0xd0 drivers/media/usb/dvb-usb-v2/gl861.c:521 Code: 93 d9 93 f9 31 ff 89 de e8 8a de 93 f9 85 db b8 ff 00 ff 96 bb 64 ff 00 64 0f 44 d8 49 81 c6 08 03 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 9e dc 03 fa 4d 8b 36 49 83 c6 38 RSP: 0018:ffffc900026e7b20 EFLAGS: 00010202 RAX: 0000000000000061 RBX: 000000006400ff64 RCX: ffff88807f1f3e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900026e7c18 R08: ffffffff907a627f R09: 1ffffffff20f4c4f R10: dffffc0000000000 R11: ffffffff883434e0 R12: dffffc0000000000 R13: ffff8880558f13b8 R14: 0000000000000308 R15: dffffc0000000000 FS: 00007fc833ad86c0(0000) GS:ffff888124cc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562c5103b520 CR3: 00000000730d4000 CR4: 00000000003526f0 Call Trace: dvb_usb_start_feed+0x57a/0xc70 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:308 dmx_section_feed_start_filtering+0x519/0x6b0 drivers/media/dvb-core/dvb_demux.c:977 dvb_dmxdev_filter_start+0xcdb/0x10d0 drivers/media/dvb-core/dmxdev.c:760 dvb_demux_do_ioctl+0x470/0x540 drivers/media/dvb-core/dmxdev.c:1090 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: 0033:0x7fc835311cbb 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:00007fc833ad8100 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007fc835311cbb RDX: 00007fc833ad8160 RSI: 00000000403c6f2b RDI: 0000000000000008 RBP: 00007fc833ad81a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc83537d028 R13: 00007fc8353b0120 R14: 00007fc833ad8160 R15: 00007fc8353b0114 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:friio_streaming_ctrl+0x43/0xd0 drivers/media/usb/dvb-usb-v2/gl861.c:521 Code: 93 d9 93 f9 31 ff 89 de e8 8a de 93 f9 85 db b8 ff 00 ff 96 bb 64 ff 00 64 0f 44 d8 49 81 c6 08 03 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 9e dc 03 fa 4d 8b 36 49 83 c6 38 RSP: 0018:ffffc900026e7b20 EFLAGS: 00010202 RAX: 0000000000000061 RBX: 000000006400ff64 RCX: ffff88807f1f3e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900026e7c18 R08: ffffffff907a627f R09: 1ffffffff20f4c4f R10: dffffc0000000000 R11: ffffffff883434e0 R12: dffffc0000000000 R13: ffff8880558f13b8 R14: 0000000000000308 R15: dffffc0000000000 FS: 00007fc833ad86c0(0000) GS:ffff888124dc7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4798882fb3 CR3: 00000000730d4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 93 xchg %eax,%ebx 1: d9 93 f9 31 ff 89 fsts -0x7600ce07(%rbx) 7: de e8 fsubrp %st,%st(0) 9: 8a de mov %dh,%bl b: 93 xchg %eax,%ebx c: f9 stc d: 85 db test %ebx,%ebx f: b8 ff 00 ff 96 mov $0x96ff00ff,%eax 14: bb 64 ff 00 64 mov $0x6400ff64,%ebx 19: 0f 44 d8 cmove %eax,%ebx 1c: 49 81 c6 08 03 00 00 add $0x308,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 9e dc 03 fa call 0xfa03dcd7 39: 4d 8b 36 mov (%r14),%r14 3c: 49 83 c6 38 add $0x38,%r14 --- 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