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-rw-r--r--drivers/watchdog/jz4740_wdt.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index 935562322b38..684ba01fb540 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -130,11 +130,18 @@ static ssize_t jz4740_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
if (len) {
- if (data[len-1] == 'V')
- set_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status);
- else
- clear_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status);
+ size_t i;
+ clear_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status);
+ for (i = 0; i != len; i++) {
+ char c;
+
+ if (get_user(c, data + i))
+ return -EFAULT;
+
+ if (c == 'V')
+ set_bit(WDT_OK_TO_CLOSE, &jz4740_wdt.status);
+ }
jz4740_wdt_service();
}