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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org, "Richard Weinberger" <richard@nod.at>
Date:   Sun, 09 Dec 2018 21:50:33 +0000
Message-ID: <lsq.1544392233.982921311@decadent.org.uk>
Subject: [PATCH 3.16 139/328] ubifs: Fix memory leak in lprobs self-check
In-Reply-To: <lsq.1544392232.713909046@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
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3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@nod.at>

commit eef19816ada3abd56d9f20c88794cc2fea83ebb2 upstream.

Allocate the buffer after we return early.
Otherwise memory is being leaked.

Fixes: 1e51764a3c2a ("UBIFS: add new flash file system")
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 fs/ubifs/lprops.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/fs/ubifs/lprops.c
+++ b/fs/ubifs/lprops.c
@@ -1091,10 +1091,6 @@ static int scan_check_cb(struct ubifs_in
 		}
 	}
 
-	buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
 	/*
 	 * After an unclean unmount, empty and freeable LEBs
 	 * may contain garbage - do not scan them.
@@ -1113,6 +1109,10 @@ static int scan_check_cb(struct ubifs_in
 		return LPT_SCAN_CONTINUE;
 	}
 
+	buf = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
 	sleb = ubifs_scan(c, lnum, 0, buf, 0);
 	if (IS_ERR(sleb)) {
 		ret = PTR_ERR(sleb);