linux-kernel - [PATCH mtd-utils] nandflipbits: fix corrupted oob

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Date:   Thu, 16 Jun 2022 09:39:43 +0200
From:   Christophe Kerello <christophe.kerello@...s.st.com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Christophe Kerello <christophe.kerello@...s.st.com>
Subject: [PATCH mtd-utils] nandflipbits: fix corrupted oob

If a bit is flipped in block 1 or higher, the OOB is corrupted with the
OOB of block 0. Mtd_read_oob API has to take into account the block number
to be able to calculate the right offset.

Fixes: 9fc8db29cf62 ("mtd-utils: Add nandflipbits tool")
Signed-off-by: Christophe Kerello <christophe.kerello@...s.st.com>
---
 nand-utils/nandflipbits.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nand-utils/nandflipbits.c b/nand-utils/nandflipbits.c
index aa6850f..cd66d0b 100644
--- a/nand-utils/nandflipbits.c
+++ b/nand-utils/nandflipbits.c
@@ -249,7 +249,9 @@ int main(int argc, char **argv)
 
 			bufoffs += mtd.min_io_size;
 
-			ret = mtd_read_oob(mtd_desc, &mtd, fd, blkoffs,
+			ret = mtd_read_oob(mtd_desc, &mtd, fd,
+					   bit_to_flip->block * mtd.eb_size +
+					   blkoffs,
 					   mtd.oob_size, buffer + bufoffs);
 			if (ret) {
 				fprintf(stderr, "MTD OOB read failure\n");
-- 
2.25.1