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authorHans de Goede <hdegoede@redhat.com>2010-01-25 17:00:50 +0300
committerJean Delvare <khali@linux-fr.org>2010-01-25 17:00:50 +0300
commitc453615f77aa51593c1c9c9031b4278797d3fd19 (patch)
tree7d6c05c9487b311d4f276d4c4bdf42d4e06fa445 /drivers/hwmon/fschmd.c
parent5542482b9c61c2588f1178f315310a794988051a (diff)
downloadlinux-c453615f77aa51593c1c9c9031b4278797d3fd19.tar.xz
hwmon: (fschmd) Fix a memleak on multiple opens of /dev/watchdog
When /dev/watchdog gets opened a second time we return -EBUSY, but we already have got a kref then, so we end up leaking our data struct. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: stable@kernel.org
Diffstat (limited to 'drivers/hwmon/fschmd.c')
-rw-r--r--drivers/hwmon/fschmd.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/hwmon/fschmd.c b/drivers/hwmon/fschmd.c
index bd0fc67e804b..fa0728232e71 100644
--- a/drivers/hwmon/fschmd.c
+++ b/drivers/hwmon/fschmd.c
@@ -768,6 +768,7 @@ leave:
static int watchdog_open(struct inode *inode, struct file *filp)
{
struct fschmd_data *pos, *data = NULL;
+ int watchdog_is_open;
/* We get called from drivers/char/misc.c with misc_mtx hold, and we
call misc_register() from fschmd_probe() with watchdog_data_mutex
@@ -782,10 +783,12 @@ static int watchdog_open(struct inode *inode, struct file *filp)
}
}
/* Note we can never not have found data, so we don't check for this */
- kref_get(&data->kref);
+ watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
+ if (!watchdog_is_open)
+ kref_get(&data->kref);
mutex_unlock(&watchdog_data_mutex);
- if (test_and_set_bit(0, &data->watchdog_is_open))
+ if (watchdog_is_open)
return -EBUSY;
/* Start the watchdog */