linux-kernel - [PATCH] ubifs: Fix memory leak in lprobs self-check

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Message-Id: <20180612184945.7544-1-richard@nod.at>
Date:   Tue, 12 Jun 2018 20:49:45 +0200
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        stable@...r.kernel.org
Subject: [PATCH] ubifs: Fix memory leak in lprobs self-check

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

Cc: <stable@...r.kernel.org>
Fixes: 1e51764a3c2a ("UBIFS: add new flash file system")
Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/lprops.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/ubifs/lprops.c b/fs/ubifs/lprops.c
index f5a46844340c..8ade493a423a 100644
--- a/fs/ubifs/lprops.c
+++ b/fs/ubifs/lprops.c
@@ -1089,10 +1089,6 @@ static int scan_check_cb(struct ubifs_info *c,
 		}
 	}
 
-	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.
@@ -1111,6 +1107,10 @@ static int scan_check_cb(struct ubifs_info *c,
 		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);
-- 
2.13.6