linux-kernel - [PATCH 2/2] hfsplus: fix potential refcnt problem of nls module

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Message-Id: <1523948733-8537-2-git-send-email-cgxu519@gmx.com>
Date:   Tue, 17 Apr 2018 15:05:33 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     linux-fsdevel@...r.kernel.org
Cc:     dhowells@...hat.com, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        pombredanne@...b.com, linux-kernel@...r.kernel.org,
        Chengguang Xu <cgxu519@....com>
Subject: [PATCH 2/2] hfsplus: fix potential refcnt problem of nls module

When specifying nls option multiple times in a mount,
current option parsing will cause inaccurate refcount of nls
module. Hence, call unload_nls for previous one in this case.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 fs/hfsplus/options.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
index 047e05c..068d4e2 100644
--- a/fs/hfsplus/options.c
+++ b/fs/hfsplus/options.c
@@ -171,8 +171,10 @@ int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
 				return 0;
 			}
 			p = match_strdup(&args[0]);
-			if (p)
+			if (p) {
+				unload_nls(sbi->nls);
 				sbi->nls = load_nls(p);
+			}
 			if (!sbi->nls) {
 				pr_err("unable to load nls mapping \"%s\"\n",
 				       p);
-- 
1.8.3.1