oh, sorry, it is my fault.
according to fill_write_buffer in fs/sysfs/file.c,
we can assume that 'const char *buf' must be '\0' based string.
please skip this patch.
gchen.
于 2013年01月20日 17:53, Chen Gang 写道:
>
> the parameter 'const char *buf' may be not '\0' based string.
> so need check the length before use it.
>
> additinal info:
> originally, it had the relative checking.
> but it was deleted when fix another issues (using strlcpy instead of
> strncpy)
> and now, we need restore the checking (but still keep strlcpy)
>
> Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
> ---
> drivers/net/wireless/iwlegacy/3945-mac.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/iwlegacy/3945-mac.c
> b/drivers/net/wireless/iwlegacy/3945-mac.c
> index 050ce7c..71cdbac 100644
> --- a/drivers/net/wireless/iwlegacy/3945-mac.c
> +++ b/drivers/net/wireless/iwlegacy/3945-mac.c
> @@ -3273,7 +3273,7 @@ il3945_store_measurement(struct device *d, struct
> device_attribute *attr,
>
> if (count) {
> char *p = buffer;
> - strlcpy(buffer, buf, sizeof(buffer));
> + strlcpy(buffer, buf, min(sizeof(buffer), count));
> channel = simple_strtoul(p, NULL, 0);
> if (channel)
> params.channel = channel;
>
--
Chen Gang
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