linux-kernel - Re: [PATCH 1/1] Char: ipmi_bt

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Message-ID: <533023F5.40909@suse.cz>
Date:	Mon, 24 Mar 2014 13:24:21 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	minyard@....org
CC:	jirislaby@...il.com, linux-kernel@...r.kernel.org,
	Tomas Cech <tcech@...e.cz>,
	openipmi-developer@...ts.sourceforge.net,
	Rocky Craig <rocky.craig@...com>
Subject: Re: [PATCH 1/1] Char: ipmi_bt_sm, fix infinite loop

On 02/25/2014 10:50 PM, Corey Minyard wrote:
> Looks right to me.  Rocky, copying you in case there's an issue with this.

Hi,

any updates here, I don't see it in the -next tree yet?

Thanks.

> On 02/25/2014 04:14 AM, Jiri Slaby wrote:
>> In read_all_bytes, we do
>>   unsigned char i;
>> ...
>>   bt->read_data[0] = BMC2HOST;
>>   bt->read_count = bt->read_data[0];
>> ...
>>   for (i = 1; i <= bt->read_count; i++)
>>     bt->read_data[i] = BMC2HOST;
>>
>> If bt->read_data[0] == bt->read_count == 255, we loop infinitely in
>> the 'for' loop. Make 'i' an 'int' instead of 'char' to get rid of the
>> overflow and finish the loop after 255 iterations every time.
>>
>> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
>> Reported-and-debugged-by: Rui Hui Dian <rhdian@...ell.com>
>> Cc: Tomas Cech <tcech@...e.cz>
>> Cc: Corey Minyard <minyard@....org>
>> Cc: <openipmi-developer@...ts.sourceforge.net>
>> ---
>>  drivers/char/ipmi/ipmi_bt_sm.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/char/ipmi/ipmi_bt_sm.c b/drivers/char/ipmi/ipmi_bt_sm.c
>> index f5e4cd7617f6..61e71616689b 100644
>> --- a/drivers/char/ipmi/ipmi_bt_sm.c
>> +++ b/drivers/char/ipmi/ipmi_bt_sm.c
>> @@ -352,7 +352,7 @@ static inline void write_all_bytes(struct si_sm_data *bt)
>>  
>>  static inline int read_all_bytes(struct si_sm_data *bt)
>>  {
>> -	unsigned char i;
>> +	unsigned int i;
>>  
>>  	/*
>>  	 * length is "framing info", minimum = 4: NetFn, Seq, Cmd, cCode.
> 


-- 
js
suse labs
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