[CPUFREQ] fix show_trans_table
Fix show_trans_table when it overflows PAGE_SIZE.
* Not all snprintf calls were protected against being passed a negative
length.
* When show_trans_table overflows, len might be > PAGE_SIZE. In that case,
returns PAGE_SIZE.
Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 070421a..ef09e06 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -114,7 +114,7 @@
stat->freq_table[i]);
}
if (len >= PAGE_SIZE)
- return len;
+ return PAGE_SIZE;
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
@@ -131,8 +131,12 @@
len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
stat->trans_table[i*stat->max_state+j]);
}
+ if (len >= PAGE_SIZE)
+ break;
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
}
+ if (len >= PAGE_SIZE)
+ return PAGE_SIZE;
return len;
}
CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table);