Hi Greg, Sasha,

just a gentle ping for the backport request below.

Thanks!

Am 11.01.22 um 16:33 schrieb Frieder Schrempf:

Hi stable maintainers,

On 06.04.21 03:47, Yoshio Furuyama wrote:

...

From: "Doyle, Patrick" pdoyle@irobot.com

In the unlikely event that both blocks 10 and 11 are marked as bad (on a 32 bit machine), then the process of marking block 10 as bad stomps on cached entry for block 11. There are (of course) other examples.

Signed-off-by: Patrick Doyle pdoyle@irobot.com Reviewed-by: Richard Weinberger richard@nod.at

We have systems on which this patch fixes real failures. Could you please add the upstream patch fd0d8d85f723 ("mtd: nand: bbt: Fix corner case in bad block table handling") to the stable queues for 4.19, 5.4, 5.10?

Thanks!

Cc: stable@vger.kernel.org Fixes: 9c3736a3de21 ("mtd: nand: Add core infrastructure to deal with NAND devices")

...

---

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

diff --git a/drivers/mtd/nand/bbt.c b/drivers/mtd/nand/bbt.c index 044adf913854..64af6898131d 100644 --- a/drivers/mtd/nand/bbt.c +++ b/drivers/mtd/nand/bbt.c @@ -123,7 +123,7 @@ int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry, unsigned int rbits = bits_per_block + offs - BITS_PER_LONG; pos[1] &= ~GENMASK(rbits - 1, 0);

• pos[1] |= val >> rbits;
  

• pos[1] |= val >> (bits_per_block - rbits);
  

  }

return 0;