[PATCH -next] lightnvm: fix possible memory leak in pblk_bb_discovery()

[Wei Yongjun]

From: Wei Yongjun <weiyongj...@huawei.com>

'blks' is malloced in pblk_bb_discovery() and should be freed
before leaving from the nvm_get_tgt_bb_tbl() error handling cases,
otherwise it will cause memory leak. Also skip assign blks to
rlun->bb_list when error.

Fixes: a4bd217b4326 ("lightnvm: physical block device (pblk) target")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 drivers/lightnvm/pblk-init.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 3996e4b..5c8f404 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -399,13 +399,15 @@ static int pblk_bb_discovery(struct nvm_tgt_dev *dev, 
struct pblk_lun *rlun)
 
        nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks);
        if (nr_blks < 0) {
-               kfree(blks);
                ret = nr_blks;
+               goto out;
        }
 
        rlun->bb_list = blks;
 
+       return 0;
 out:
+       kfree(blks);
        return ret;
 }