From 888aed97ac127d477527dc06b5ce9259cf509e13 Mon Sep 17 00:00:00 2001 From: Rashika Kheria Date: Sun, 10 Nov 2013 22:13:53 +0530 Subject: Staging: zram: Fix memory leak by refcount mismatch 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 Acked-by: Jerome Marchand Cc: stable@vger.kernel.org Signed-off-by: Rashika Kheria Signed-off-by: Greg Kroah-Hartman --- drivers/staging/zram/zram_drv.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'drivers/staging') diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 5c56b38..d22e5ad 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -663,21 +663,30 @@ static ssize_t reset_store(struct device *dev, 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) -- cgit v1.1