linux-kernel - [PATCH 5.5 103/367] ubifs: Fix wrong memory allocation

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Message-Id: <20200210122433.887802292@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:30:16 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Naga Sureshkumar Relli <nagasure@...inx.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 5.5 103/367] ubifs: Fix wrong memory allocation

From: Sascha Hauer <s.hauer@...gutronix.de>

commit edec51374bce779f37fc209a228139c55d90ec8d upstream.

In create_default_filesystem() when we allocate the idx node we must use
the idx_node_size we calculated just one line before, not tmp, which
contains completely other data.

Fixes: c4de6d7e4319 ("ubifs: Refactor create_default_filesystem()")
Cc: stable@...r.kernel.org # v4.20+
Reported-by: Naga Sureshkumar Relli <nagasure@...inx.com>
Tested-by: Naga Sureshkumar Relli <nagasure@...inx.com>
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ubifs/sb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -161,7 +161,7 @@ static int create_default_filesystem(str
 	sup = kzalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_KERNEL);
 	mst = kzalloc(c->mst_node_alsz, GFP_KERNEL);
 	idx_node_size = ubifs_idx_node_sz(c, 1);
-	idx = kzalloc(ALIGN(tmp, c->min_io_size), GFP_KERNEL);
+	idx = kzalloc(ALIGN(idx_node_size, c->min_io_size), GFP_KERNEL);
 	ino = kzalloc(ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size), GFP_KERNEL);
 	cs = kzalloc(ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size), GFP_KERNEL);