linux-kernel - Re: [Linux-kernel-mentees] [PATCH net] AX.25: Prevent out-of-bounds read in ax25

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Date:   Wed, 22 Jul 2020 18:07:23 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yepeilin.cs@...il.com
Cc:     jreuter@...na.de, ralf@...ux-mips.org, gregkh@...uxfoundation.org,
        syzkaller-bugs@...glegroups.com,
        linux-kernel-mentees@...ts.linuxfoundation.org, kuba@...nel.org,
        linux-hams@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH net] AX.25: Prevent
 out-of-bounds read in ax25_sendmsg()

From: Peilin Ye <yepeilin.cs@...il.com>
Date: Wed, 22 Jul 2020 12:05:12 -0400

> Checks on `addr_len` and `usax->sax25_ndigis` are insufficient.
> ax25_sendmsg() can go out of bounds when `usax->sax25_ndigis` equals to 7
> or 8. Fix it.
> 
> It is safe to remove `usax->sax25_ndigis > AX25_MAX_DIGIS`, since
> `addr_len` is guaranteed to be less than or equal to
> `sizeof(struct full_sockaddr_ax25)`
> 
> Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>

Applied.