linux-kernel - [PATCH 3.18 65/85] mtd: cfi_cmdset_0002: fix SEGV unlocking multiple chips

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Date:   Sun,  1 Jul 2018 18:02:23 +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 3.18 65/85] mtd: cfi_cmdset_0002: fix SEGV unlocking multiple chips

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

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

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

commit 5fdfc3dbad099281bf027a353d5786c09408a8e5 upstream.

cfi_ppb_unlock() tries to relock all sectors that were locked before
unlocking the whole chip.
This locking used the chip start address + the FULL offset from the
first flash chip, thereby forming an illegal address. Fix that by using
the chip offset(adr).

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 |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -2533,7 +2533,7 @@ static int cfi_atmel_unlock(struct mtd_i
 
 struct ppb_lock {
 	struct flchip *chip;
-	loff_t offset;
+	unsigned long adr;
 	int locked;
 };
 
@@ -2669,7 +2669,7 @@ static int __maybe_unused cfi_ppb_unlock
 		 */
 		if ((adr < ofs) || (adr >= (ofs + len))) {
 			sect[sectors].chip = &cfi->chips[chipnum];
-			sect[sectors].offset = offset;
+			sect[sectors].adr = adr;
 			sect[sectors].locked = do_ppb_xxlock(
 				map, &cfi->chips[chipnum], adr, 0,
 				DO_XXLOCK_ONEBLOCK_GETLOCK);
@@ -2713,7 +2713,7 @@ static int __maybe_unused cfi_ppb_unlock
 	 */
 	for (i = 0; i < sectors; i++) {
 		if (sect[i].locked)
-			do_ppb_xxlock(map, sect[i].chip, sect[i].offset, 0,
+			do_ppb_xxlock(map, sect[i].chip, sect[i].adr, 0,
 				      DO_XXLOCK_ONEBLOCK_LOCK);
 	}