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| author |   Wim Van Sebroeck <wim@iguana.be> | 2011-01-16 19:05:39 +0000 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2011-03-15 16:01:57 +0000 |
| commit | 742e4b630895d751812b0682750db76c8072bf37 (patch) | |
| tree | 0a2b75d932e1f924898de3584e5ed1b4b671b0b9 /drivers/watchdog | |
| parent | watchdog: add JZ4740 watchdog driver (diff) | |
| download | linux-dev-742e4b630895d751812b0682750db76c8072bf37.tar.xz linux-dev-742e4b630895d751812b0682750db76c8072bf37.zip | |
watchdog: jz4740_wdt - fix magic character checking
When writing to /dev/watchdog all characters should be checked
for the magic character 'V'.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
| -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(); } |