linux-kernel - [PATCH 4.9 044/101] mtd: cfi_cmdset_0002: Avoid walking all chips when unlocking.

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Message-Id: <20180701160758.919971773@linuxfoundation.org>
Date:   Sun,  1 Jul 2018 18:21:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Joakim Tjernlund <joakim.tjernlund@...inera.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>
Subject: [PATCH 4.9 044/101] mtd: cfi_cmdset_0002: Avoid walking all chips when unlocking.

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Joakim Tjernlund <joakim.tjernlund@...inera.com>

commit f1ce87f6080b1dda7e7b1eda3da332add19d87b9 upstream.

cfi_ppb_unlock() walks all flash chips when unlocking sectors,
avoid walking chips unaffected by the unlock operation.

Fixes: 1648eaaa1575 ("mtd: cfi_cmdset_0002: Support Persistent Protection Bits (PPB) locking")
Cc: stable@...r.kernel.org
Signed-off-by: Joakim Tjernlund <joakim.tjernlund@...inera.com>
Signed-off-by: Boris Brezillon <boris.brezillon@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/chips/cfi_cmdset_0002.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -2681,6 +2681,8 @@ static int __maybe_unused cfi_ppb_unlock
 			i++;
 
 		if (adr >> cfi->chipshift) {
+			if (offset >= (ofs + len))
+				break;
 			adr = 0;
 			chipnum++;