syzbot has found a reproducer for the following issue on: HEAD commit: 88264981f208 Merge tag 'sched_ext-for-6.12' of git://git.k.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=125cec27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=547de13ee0a4d284 dashboard link: https://syzkaller.appspot.com/bug?extid=8f282cce71948071c335 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108bb080580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165cec27980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d83fc781c223/disk-88264981.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1ed4c5969fba/vmlinux-88264981.xz kernel image: https://storage.googleapis.com/syzbot-assets/76a67bd894be/bzImage-88264981.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8f282cce71948071c335@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x597/0x2350 drivers/usb/core/urb.c:430 usb_submit_urb+0x597/0x2350 drivers/usb/core/urb.c:430 usbtmc_generic_write+0x7b6/0xe80 drivers/usb/class/usbtmc.c:1213 usbtmc_write+0xdb7/0x1210 drivers/usb/class/usbtmc.c:1622 vfs_write+0x487/0x1540 fs/read_write.c:681 ksys_write+0x20f/0x4c0 fs/read_write.c:736 __do_sys_write fs/read_write.c:748 [inline] __se_sys_write fs/read_write.c:745 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:745 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4092 [inline] slab_alloc_node mm/slub.c:4135 [inline] __kmalloc_cache_noprof+0x4f0/0xb00 mm/slub.c:4291 kmalloc_noprof include/linux/slab.h:878 [inline] usbtmc_create_urb drivers/usb/class/usbtmc.c:757 [inline] usbtmc_generic_write+0x430/0xe80 drivers/usb/class/usbtmc.c:1176 usbtmc_write+0xdb7/0x1210 drivers/usb/class/usbtmc.c:1622 vfs_write+0x487/0x1540 fs/read_write.c:681 ksys_write+0x20f/0x4c0 fs/read_write.c:736 __do_sys_write fs/read_write.c:748 [inline] __se_sys_write fs/read_write.c:745 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:745 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Byte 3 of 4 is uninitialized Memory access of size 4 starts at ffff8881150f6000 CPU: 1 UID: 0 PID: 5201 Comm: syz-executor176 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ===================================================== --- 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.
