mtd: cfi_cmdset_0002: Fix unlocking requests crossing a chip boudary

commit 0cd8116f172eed018907303dbff5c112690eeb91 upstream.

The "sector is in requested range" test used to determine whether
sectors should be re-locked or not is done on a variable that is reset
everytime we cross a chip boundary, which can lead to some blocks being
re-locked while the caller expect them to be unlocked.
Fix the check to make sure this cannot happen.

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

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index b6cbe68..c3e90e6 100644 (file)
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -2669,7 +2669,7 @@ static int __maybe_unused cfi_ppb_unlock(struct mtd_info *mtd, loff_t ofs,
                 * sectors shall be unlocked, so lets keep their locking
                 * status at "unlocked" (locked=0) for the final re-locking.
                 */
-               if ((adr < ofs) || (adr >= (ofs + len))) {
+               if ((offset < ofs) || (offset >= (ofs + len))) {
                        sect[sectors].chip = &cfi->chips[chipnum];
                        sect[sectors].adr = adr;
                        sect[sectors].locked = do_ppb_xxlock(