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Staging: zram: Fix memory leak by refcount mismatch

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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>
Cc: stable@vger.kernel.org
Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rashika Kheria 2013-11-10 22:13:53 +05:30 committed by Greg Kroah-Hartman
parent 9df682927c
commit 1b672224d1
1 changed files with 14 additions and 5 deletions
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19
drivers/staging/zram/zram_drv.c
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@ -652,21 +652,30 @@ 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)