linux-kernel - [PATCH 4.19 1/8] Revert "mtd: spinand: Fix OOB read"

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Message-Id: <20210107143047.732584985@linuxfoundation.org>
Date:   Thu,  7 Jan 2021 15:32:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Felix Fietkau <nbd@....name>
Subject: [PATCH 4.19 1/8] Revert "mtd: spinand: Fix OOB read"

From: Felix Fietkau <nbd@....name>

This reverts stable commit baad618d078c857f99cc286ea249e9629159901f.

This commit is adding lines to spinand_write_to_cache_op, wheras the upstream
commit 868cbe2a6dcee451bd8f87cbbb2a73cf463b57e5 that this was supposed to
backport was touching spinand_read_from_cache_op.
It causes a crash on writing OOB data by attempting to write to read-only
kernel memory.

Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mtd/nand/spi/core.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -378,10 +378,6 @@ static int spinand_write_to_cache_op(str
 		}
 	}
 
-	if (req->ooblen)
-		memcpy(req->oobbuf.in, spinand->oobbuf + req->ooboffs,
-		       req->ooblen);
-
 	return 0;
 }