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    Subject[PATCH 3.12 013/212] Staging: zram: Fix memory leak by refcount mismatch
    Date
    3.12-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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>

    ---
    drivers/staging/zram/zram_drv.c | 19 ++++++++++++++-----
    1 file changed, 14 insertions(+), 5 deletions(-)

    --- a/drivers/staging/zram/zram_drv.c
    +++ b/drivers/staging/zram/zram_drv.c
    @@ -652,21 +652,30 @@ 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 = kstrtou16(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);

    zram_reset_device(zram, true);
    return len;
    +
    +out:
    + bdput(bdev);
    + return ret;
    }

    static void __zram_make_request(struct zram *zram, struct bio *bio, int rw)



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