From: Igor Konopko <igor.j.konopko@intel.com>
Date: Fri, 1 Jun 2018 16:41:09 +0200
Subject: [PATCH] lightnvm: fix partial read error path
Git-commit: fbadca7396b97d95e2390c97506358f4f9dce7c7
Patch-mainline: v4.18-rc1
References: bsc#1104967,FATE#325924
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When error occurs during bio_add_page on partial read path, pblk
tries to free pages twice.

Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Marcin Dziegielewski <marcin.dziegielewski@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/lightnvm/pblk-read.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index 38f89a84ce5e..f770fd113ffe 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -256,7 +256,7 @@ static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
 	new_bio = bio_alloc(GFP_KERNEL, nr_holes);
 
 	if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
-		goto err;
+		goto err_add_pages;
 
 	if (nr_holes != new_bio->bi_vcnt) {
 		pr_err("pblk: malformed bio\n");
@@ -347,10 +347,10 @@ static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
 	return NVM_IO_OK;
 
 err:
-	pr_err("pblk: failed to perform partial read\n");
-
 	/* Free allocated pages in new bio */
-	pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt);
+	pblk_bio_free_pages(pblk, new_bio, 0, new_bio->bi_vcnt);
+err_add_pages:
+	pr_err("pblk: failed to perform partial read\n");
 	__pblk_end_io_read(pblk, rqd, false);
 	return NVM_IO_ERR;
 }
-- 
2.12.3