linux-kernel - Re: [syzbot] [wireless?] KMSAN: uninit-value in skb

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Message-ID: <00000000000099fa6e061f7c815c@google.com>
Date: Mon, 12 Aug 2024 06:31:10 -0700
From: syzbot <syzbot+98afa303be379af6cdb2@...kaller.appspotmail.com>
To: toke@...e.dk
Cc: kvalo@...nel.org, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, toke@...e.dk
Subject: Re: [syzbot] [wireless?] KMSAN: uninit-value in skb_trim (2)

> syzbot <syzbot+98afa303be379af6cdb2@...kaller.appspotmail.com> writes:
>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    b446a2dae984 Merge tag 'linux_kselftest-fixes-6.11-rc3' of..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=13eb467d980000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=305509ad8eb5f9b8
>> dashboard link: https://syzkaller.appspot.com/bug?extid=98afa303be379af6cdb2
>> 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/49d96e53e1c4/disk-b446a2da.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/f05350d128a7/vmlinux-b446a2da.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/805c7d86a2db/bzImage-b446a2da.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+98afa303be379af6cdb2@...kaller.appspotmail.com
>
> #syz test

This crash does not have a reproducer. I cannot test it.

>
> diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
> index 0c7841f95228..f77cb743ca06 100644
> --- a/drivers/net/wireless/ath/ath9k/hif_usb.c
> +++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
> @@ -755,7 +755,7 @@ static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
>                 goto free_skb;
>         default:
>                 skb_reset_tail_pointer(skb);
> -               skb_trim(skb, 0);
> +               __skb_trim(skb, 0);
>  
>                 goto resubmit;
>         }