From: syzbot <syzbot+fb4362a104d45ab09cf9@syzkaller.appspotmail.com>
To: abbotti@mev.co.uk
Cc: abbotti@mev.co.uk, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in do_insnlist_ioctl
Date: Fri, 25 Jul 2025 03:23:55 -0700 [thread overview]
Message-ID: <68835b3b.a00a0220.2f88df.0044.GAE@google.com> (raw)
In-Reply-To: <20250725112352.56640b40@ian-deb>
> #syz test
This crash does not have a reproducer. I cannot test it.
>
> diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c
> index 23b7178522ae..360fde417016 100644
> --- a/drivers/comedi/comedi_fops.c
> +++ b/drivers/comedi/comedi_fops.c
> @@ -1587,6 +1587,10 @@ static int do_insnlist_ioctl(struct comedi_device *dev,
> memset(&data[n], 0, (MIN_SAMPLES - n) *
> sizeof(unsigned int));
> }
> + } else {
> + unsigned int n_min = max(n, (unsigned int)MIN_SAMPLES);
> +
> + memset(data, 0, n_min * sizeof(unsigned int));
> }
> ret = parse_insn(dev, insns + i, data, file);
> if (ret < 0)
> @@ -1670,6 +1674,8 @@ static int do_insn_ioctl(struct comedi_device *dev,
> memset(&data[insn->n], 0,
> (MIN_SAMPLES - insn->n) * sizeof(unsigned int));
> }
> + } else {
> + memset(data, 0, n_data * sizeof(unsigned int));
> }
> ret = parse_insn(dev, insn, data, file);
> if (ret < 0)
next parent reply other threads:[~2025-07-25 10:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250725112352.56640b40@ian-deb>
2025-07-25 10:23 ` syzbot [this message]
2025-07-21 19:30 syzbot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=68835b3b.a00a0220.2f88df.0044.GAE@google.com \
--to=syzbot+fb4362a104d45ab09cf9@syzkaller.appspotmail.com \
--cc=abbotti@mev.co.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®