linux-kernel - [PATCH] dlm: fixed memory leaks after failed ls_remove

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Message-ID: <51f8a4a6-4fa8-740c-b274-fb521853ef05@virtuozzo.com>
Date:   Thu, 15 Nov 2018 09:45:01 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     linux-kernel@...r.kernel.org,
        Christine Caulfield <ccaulfie@...hat.com>,
        David Teigland <teigland@...hat.com>, cluster-devel@...hat.com
Subject: [PATCH] dlm: fixed memory leaks after failed ls_remove_names
 allocation

If allocation fails on last elements of array need to free already
allocated elements.

Fixes 789924ba635f ("dlm: fix race between remove and lookup")
Cc: stable@...nel.org # 3.6

Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 fs/dlm/lockspace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index 5ba94be006ee..f99e110a0af8 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -532,7 +532,7 @@ static int new_lockspace(const char *name, const char *cluster,
 		ls->ls_remove_names[i] = kzalloc(DLM_RESNAME_MAXLEN+1,
 						 GFP_KERNEL);
 		if (!ls->ls_remove_names[i])
-			goto out_rsbtbl;
+			goto out_remove_names;
 	}
 
 	idr_init(&ls->ls_lkbidr);
@@ -680,6 +680,7 @@ static int new_lockspace(const char *name, const char *cluster,
 	kfree(ls->ls_recover_buf);
  out_lkbidr:
 	idr_destroy(&ls->ls_lkbidr);
+ out_remove_names:
 	for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) {
 		if (ls->ls_remove_names[i])
 			kfree(ls->ls_remove_names[i]);
-- 
2.17.1