linux-kernel - [PATCH] lightnvm: prevent memory leak in nvm_bb_chunk

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Date:   Sun, 29 Sep 2019 21:34:14 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Matias Bjorling <mb@...htnvm.io>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] lightnvm: prevent memory leak in nvm_bb_chunk_sense

In nvm_bb_chunk_sense alloc_page allocates memory which is released at
the end of the function. But if nvm_submit_io_sync_raw fails the error
check skips the release and leaks the allocated page. To fix this issue
I moved the __free_page call before error check.

Fixes: aff3fb18f957 ("lightnvm: move bad block and chunk state logic to core")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/lightnvm/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 7543e395a2c6..5fdae518f6c9 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -849,11 +849,12 @@ static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
 	rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 
 	ret = nvm_submit_io_sync_raw(dev, &rqd);
-	if (ret)
-		return ret;
 
 	__free_page(page);
 
+	if (ret)
+		return ret;
+
 	return rqd.error;
 }
 
-- 
2.17.1