On 11/18/2011 04:11 PM, Johannes Berg wrote:
> On Fri, 2011-11-18 at 17:09 +0300, Dan Carpenter wrote:
>> This function makes the static checkers grumble. The return value of
>> snprintf() is the number of bytes which would have been copied if
>> there was enough space. In theory, a %u can take take 10 digits so
>> len could be larger than 16 and it would be a small information
>> leak.
>>
>> We may as well make the buffer larger as well since that is very
>> easy to do.
>>
>> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>>
>> diff --git a/drivers/net/wireless/ath/ath6kl/debug.c b/drivers/net/wireless/ath/ath6kl/debug.c
>> index 9eff0d0..e632008 100644
>> --- a/drivers/net/wireless/ath/ath6kl/debug.c
>> +++ b/drivers/net/wireless/ath/ath6kl/debug.c
>> @@ -1551,11 +1551,12 @@ static ssize_t ath6kl_listen_int_read(struct file *file,
>> size_t count, loff_t *ppos)
>> {
>> struct ath6kl *ar = file->private_data;
>> - char buf[16];
>> + char buf[32];
>> int len;
>>
>> len = snprintf(buf, sizeof(buf), "%u %u\n", ar->listen_intvl_t,
>> ar->listen_intvl_b);
>> + len = min(sizeof(buf), len);
>
> Maybe that should be scnprintf instead then?
Yeah, I agree. And most likely debug.c has even more cases where
scnprintf() is needed.
Kalle
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