The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 58589a75bba96f43b62d8069b35be081bc00d7c3 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko andriy.shevchenko@linux.intel.com Date: Thu, 25 Nov 2021 23:27:29 +0200 Subject: [PATCH] misc: at25: Check proper value of chip length in FRAM case

Obviously the byte_len value should be checked from the chip and not from at25->chip.

Fixes: fd307a4ad332 ("nvmem: prepare basics for FRAM support") Acked-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Link: https://lore.kernel.org/r/20211125212729.86585-4-andriy.shevchenko@linux.int... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c index f0b0efc30ee6..e21216541b0f 100644 --- a/drivers/misc/eeprom/at25.c +++ b/drivers/misc/eeprom/at25.c @@ -433,9 +433,9 @@ static int at25_probe(struct spi_device *spi) dev_err(&spi->dev, "Error: unsupported size (id %02x)\n", id[7]); return -ENODEV; } - chip.byte_len = int_pow(2, id[7] - 0x21 + 4) * 1024;

- if (at25->chip.byte_len > 64 * 1024) + chip.byte_len = int_pow(2, id[7] - 0x21 + 4) * 1024; + if (chip.byte_len > 64 * 1024) at25->chip.flags |= EE_ADDR3; else at25->chip.flags |= EE_ADDR2;