linux-kernel - [PATCH 5.4 241/261] mtd: rawnand: onfi: Fix redundancy detection check

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Date:   Fri, 19 Jun 2020 16:34:12 +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, Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <boris.brezillon@...labora.com>
Subject: [PATCH 5.4 241/261] mtd: rawnand: onfi: Fix redundancy detection check

From: Miquel Raynal <miquel.raynal@...tlin.com>

commit 1d5d08ee9b28cff907326b4ad5a2463fd2808be1 upstream.

During ONFI detection, the CRC derived from the parameter page and the
CRC supposed to be at the end of the parameter page are compared. If
they do not match, the second then the third copies of the page are
tried.

The current implementation compares the newly derived CRC with the CRC
contained in the first page only. So if this particular CRC area has
been corrupted, then the detection will fail for a wrong reason.

Fix this issue by checking the derived CRC against the right one.

Fixes: 39138c1f4a31 ("mtd: rawnand: use bit-wise majority to recover the ONFI param page")
Cc: stable@...r.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
Link: https://lore.kernel.org/linux-mtd/20200428094302.14624-4-miquel.raynal@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/nand/raw/nand_onfi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/raw/nand_onfi.c
+++ b/drivers/mtd/nand/raw/nand_onfi.c
@@ -173,7 +173,7 @@ int nand_onfi_detect(struct nand_chip *c
 		}
 
 		if (onfi_crc16(ONFI_CRC_BASE, (u8 *)&p[i], 254) ==
-				le16_to_cpu(p->crc)) {
+		    le16_to_cpu(p[i].crc)) {
 			if (i)
 				memcpy(p, &p[i], sizeof(*p));
 			break;