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Date: Sun, 16 Jun 2024 11:10:20 -0700 From: syzbot <syzbot+b78a03b570e0033aba81@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] KMSAN: uninit-value in hsr_forward_skb Hello, syzbot found the following issue on: HEAD commit: 614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b61eee980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507 dashboard link: https://syzkaller.appspot.com/bug?extid=b78a03b570e0033aba81 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b78a03b570e0033aba81@...kaller.appspotmail.com ip6gretap0: entered promiscuous mode syz_tun: entered promiscuous mode ===================================================== BUG: KMSAN: uninit-value in hsr_forward_skb+0x268c/0x30e0 net/hsr/hsr_forward.c:618 hsr_forward_skb+0x268c/0x30e0 net/hsr/hsr_forward.c:618 hsr_handle_frame+0xa20/0xb50 net/hsr/hsr_slave.c:69 __netif_receive_skb_core+0x1cff/0x6190 net/core/dev.c:5438 __netif_receive_skb_one_core net/core/dev.c:5542 [inline] __netif_receive_skb+0xca/0xa00 net/core/dev.c:5658 netif_receive_skb_internal net/core/dev.c:5744 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5804 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549 tun_get_user+0x5587/0x6a00 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb31/0x14d0 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: hsr_fill_frame_info+0x538/0x540 net/hsr/hsr_forward.c:533 fill_frame_info net/hsr/hsr_forward.c:600 [inline] hsr_forward_skb+0x6f6/0x30e0 net/hsr/hsr_forward.c:615 hsr_handle_frame+0xa20/0xb50 net/hsr/hsr_slave.c:69 __netif_receive_skb_core+0x1cff/0x6190 net/core/dev.c:5438 __netif_receive_skb_one_core net/core/dev.c:5542 [inline] __netif_receive_skb+0xca/0xa00 net/core/dev.c:5658 netif_receive_skb_internal net/core/dev.c:5744 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5804 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549 tun_get_user+0x5587/0x6a00 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb31/0x14d0 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264 alloc_pages+0x1bf/0x1e0 mm/mempolicy.c:2335 skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:2921 tun_build_skb drivers/net/tun.c:1679 [inline] tun_get_user+0x1258/0x6a00 drivers/net/tun.c:1819 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2120 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb31/0x14d0 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 PID: 5890 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 ===================================================== --- 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@...glegroups.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 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
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