[PATCH 3.2 095/185] Staging: zram: Fix memory leak by refcount mismatch

Ben Hutchings
2013-12-29T02:08:44Z

From: Rashika Kheria <rashika.kheria@gmail.com>

commit 1b672224d128ec2570eb37572ff803cfe452b4f7 upstream.

As suggested by Minchan Kim and Jerome Marchand "The code in reset_store
get the block device (bdget_disk()) but it does not put it (bdput()) when
it's done using it. The usage count is therefore incremented but never
decremented."

This patch also puts bdput() for all error cases.

Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/staging/zram/zram_sysfs.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/staging/zram/zram_sysfs.c
+++ b/drivers/staging/zram/zram_sysfs.c
@@ -99,18 +99,23 @@ static ssize_t reset_store(struct device
return -ENOMEM;

/* Do not reset an active device! */
- if (bdev->bd_holders)
- return -EBUSY;
+ if (bdev->bd_holders) {
+ ret = -EBUSY;
+ goto out;
+ }

ret = strict_strtoul(buf, 10, &do_reset);
if (ret)
- return ret;
+ goto out;

- if (!do_reset)
- return -EINVAL;
+ if (!do_reset) {
+ ret = -EINVAL;
+ goto out;
+ }

/* Make sure all pending I/O is finished */
fsync_bdev(bdev);
+ bdput(bdev);

down_write(&zram->init_lock);
if (zram->init_done)
@@ -118,6 +123,10 @@ static ssize_t reset_store(struct device
up_write(&zram->init_lock);

return len;
+
+out:
+ bdput(bdev);
+ return ret;
}

static ssize_t num_reads_show(struct device *dev,