linux-kernel - [PATCH 4.9 160/175] jfs: Fix array index bounds check in dbAdjTree

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Date:   Mon, 28 Dec 2020 13:50:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Kleikamp <dave.kleikamp@...cle.com>,
        butt3rflyh4ck <butterflyhuangxx@...il.com>
Subject: [PATCH 4.9 160/175] jfs: Fix array index bounds check in dbAdjTree

From: Dave Kleikamp <dave.kleikamp@...cle.com>

commit c61b3e4839007668360ed8b87d7da96d2e59fc6c upstream.

Bounds checking tools can flag a bug in dbAdjTree() for an array index
out of bounds in dmt_stree. Since dmt_stree can refer to the stree in
both structures dmaptree and dmapctl, use the larger array to eliminate
the false positive.

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Reported-by: butt3rflyh4ck <butterflyhuangxx@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/jfs/jfs_dmap.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/jfs/jfs_dmap.h
+++ b/fs/jfs/jfs_dmap.h
@@ -196,7 +196,7 @@ typedef union dmtree {
 #define	dmt_leafidx	t1.leafidx
 #define	dmt_height	t1.height
 #define	dmt_budmin	t1.budmin
-#define	dmt_stree	t1.stree
+#define	dmt_stree	t2.stree
 
 /*
  *	on-disk aggregate disk allocation map descriptor.