Re: [PATCH] crypto: qat - uninitialized variable in adf_hb_error_inject_write()

[Dan Carpenter]

On Fri, Feb 16, 2024 at 05:22:53PM +0000, Cabiddu, Giovanni wrote:
> > --- a/drivers/crypto/intel/qat/qat_common/adf_heartbeat_dbgfs.c
> > +++ b/drivers/crypto/intel/qat/qat_common/adf_heartbeat_dbgfs.c
> > @@ -160,16 +160,17 @@ static ssize_t adf_hb_error_inject_write(struct file *file,
> >  					 size_t count, loff_t *ppos)
> >  {
> >  	struct adf_accel_dev *accel_dev = file->private_data;
> > -	size_t written_chars;
> >  	char buf[3];
> >  	int ret;
> >  
> >  	/* last byte left as string termination */
> > -	if (count != 2)
> > +	if (*ppos != 0 || count != 2)
> Is this alone not sufficient to fix the problem? Probably I'm missing
> something.
> The function just checks the first character in buf.

I mean, technically, yes.

But leaving the last character uninitialized is ugly...  Using
simple_write_to_buffer() was inappropriate because it's not like this
code supported partial writes.  Better to just fix it all the way so no
one copy and pastes it somewhere else.

> 
> Anyway, looks correct to me.
> Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>

Thanks!

regards,
dan carpenter