linux-kernel - Re: [PATCH v2] i2c: don't pass 0 nmsgs to i2c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 30 Dec 2021 23:20:03 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     viro@...iv.linux.org.uk, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+e417648b303855b91d8a@...kaller.appspotmail.com
Subject: Re: [PATCH v2] i2c: don't pass 0 nmsgs to i2c_transfer

> -		if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
> +		if (!rdwr_arg.nmsgs || rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
>  			return -EINVAL;

Shouldn't we check the msgs pointer as well while we are here? Like in
the non-compat IOCTL code:

443  if (!rdwr_arg.msgs || rdwr_arg.nmsgs == 0)
444          return -EINVAL;



Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)