Hello, syzbot found the following issue on: HEAD commit: 4ea3c6425269 Merge tag 'powerpc-5.18-2' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=148cb824f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=307baecfd5e87ced dashboard link: https://syzkaller.appspot.com/bug?extid=1a247e36149ffd709a9b compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17279a70f00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=121dc124f00000 Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=142753df700000 final oops: https://syzkaller.appspot.com/x/report.txt?x=162753df700000 console output: https://syzkaller.appspot.com/x/log.txt?x=122753df700000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1a247e36149ffd709a9b@xxxxxxxxxxxxxxxxxxxxxxxxx pvrusb2: You need to resolve the failing condition before this driver can function. There should be some earlier messages giving more information about the problem. pvrusb2: Invalid write control endpoint ================================================================================ UBSAN: array-index-out-of-bounds in drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:602:13 index -1 is out of range for type 'int [20]' CPU: 0 PID: 1959 Comm: pvrusb2-context Not tainted 5.18.0-rc1-syzkaller-00401-g4ea3c6425269 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 ubsan_epilogue+0xb/0x50 lib/ubsan.c:151 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:283 pvr2_i2c_core_init+0xc7d/0xd30 drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:602 pvr2_hdw_setup_low drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2134 [inline] pvr2_hdw_setup drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2261 [inline] pvr2_hdw_initialize+0x787/0x37d0 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2338 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:109 [inline] pvr2_context_thread_func+0x250/0x850 drivers/media/usb/pvrusb2/pvrusb2-context.c:158 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 </TASK> ================================================================================ Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 1959 Comm: pvrusb2-context Not tainted 5.18.0-rc1-syzkaller-00401-g4ea3c6425269 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 panic+0x2d7/0x636 kernel/panic.c:250 ubsan_epilogue+0x4a/0x50 lib/ubsan.c:158 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:283 pvr2_i2c_core_init+0xc7d/0xd30 drivers/media/usb/pvrusb2/pvrusb2-i2c-core.c:602 pvr2_hdw_setup_low drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2134 [inline] pvr2_hdw_setup drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2261 [inline] pvr2_hdw_initialize+0x787/0x37d0 drivers/media/usb/pvrusb2/pvrusb2-hdw.c:2338 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:109 [inline] pvr2_context_thread_func+0x250/0x850 drivers/media/usb/pvrusb2/pvrusb2-context.c:158 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 </TASK> Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
