diff options
| -rw-r--r-- | drivers/watchdog/jz4740_wdt.c | 15 |
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(); } |