linux-kernel - Re: [PATCH] eeprom: idt_89hpesx: uninitialized data in idt_dbgfs_csr

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Message-ID: <20220706104024.GD2338@kadam>
Date:   Wed, 6 Jul 2022 13:40:24 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Serge Semin <fancer.lancer@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] eeprom: idt_89hpesx: uninitialized data in
 idt_dbgfs_csr_write()

On Wed, Jul 06, 2022 at 09:58:51AM +0300, Dan Carpenter wrote:
> The simple_write_to_buffer() here is used to copy a string from the
> user.  However the function call will succeed if it manages to read
> just one byte anywhere within the buffer while we need the whole string
> to be initialized to avoid using uninitialized data.
> 
> Fixes: cfad6425382e ("eeprom: Add IDT 89HPESx EEPROM/CSR driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---

NAK.  The strndup_user() function is too strict.  I will resend this
using memdup_user() instead.

regards,
dan carpenter