On Fri, Jun 24, 2022 at 06:10:22AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 08897940f458 Add linux-next specific files for 20220623 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=14fc8c60080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=fb185a52c6ad0a8e > dashboard link: https://syzkaller.appspot.com/bug?extid=aa620fb1ece874a3f34c > 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=116b4140080000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17ab12e4080000 > > The issue was bisected to: > > commit f2d8c2606825317b77db1f9ba0fc26ef26160b30 > Author: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Date: Mon Jun 13 14:17:03 2022 +0000 > > usb: gadget: Fix non-unique driver names in raw-gadget driver > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15b40318080000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=17b40318080000 > console output: https://syzkaller.appspot.com/x/log.txt?x=13b40318080000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+aa620fb1ece874a3f34c@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: f2d8c2606825 ("usb: gadget: Fix non-unique driver names in raw-gadget driver") > > ================================================================== > BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline] > BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] > BUG: KASAN: null-ptr-deref in ida_free+0x1b6/0x2e0 lib/idr.c:510 > Read of size 8 at addr 0000000000000000 by task syz-executor185/3627 > > CPU: 1 PID: 3627 Comm: syz-executor185 Not tainted 5.19.0-rc3-next-20220623-syzkaller #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 > kasan_report+0xbe/0x1f0 mm/kasan/report.c:495 > check_region_inline mm/kasan/generic.c:183 [inline] > kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 > instrument_atomic_read include/linux/instrumented.h:71 [inline] > test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] > ida_free+0x1b6/0x2e0 lib/idr.c:510 > dev_free+0xec/0x700 drivers/usb/gadget/legacy/raw_gadget.c:212 > kref_put include/linux/kref.h:65 [inline] > raw_release+0x219/0x290 drivers/usb/gadget/legacy/raw_gadget.c:424 > __fput+0x277/0x9d0 fs/file_table.c:317 > task_work_run+0xdd/0x1a0 kernel/task_work.c:177 > exit_task_work include/linux/task_work.h:38 [inline] > do_exit+0xb05/0x2a00 kernel/exit.c:795 > do_group_exit+0xd2/0x2f0 kernel/exit.c:925 > __do_sys_exit_group kernel/exit.c:936 [inline] > __se_sys_exit_group kernel/exit.c:934 [inline] > __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x46/0xb0 > RIP: 0033:0x7f12d28b6bd9 > Code: Unable to access opcode bytes at RIP 0x7f12d28b6baf. > RSP: 002b:00007ffea2859da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 00007f12d292b3f0 RCX: 00007f12d28b6bd9 > RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 > RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 000000000000000b > R10: 00007ffea2857e00 R11: 0000000000000246 R12: 00007f12d292b3f0 > R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 > </TASK> > ================================================================== This should be fixed by the patch that was just merged. Alan Stern #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git 90bc2af24638
