4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -2685,6 +2685,8 @@ static int __maybe_unused cfi_ppb_unlock
i++;
if (adr >> cfi->chipshift) {
+ if (offset >= (ofs + len))
+ break;
adr = 0;
chipnum++;
