2017-02-15 09:05:24 +00:00
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From 42ebff638003be18fab503b37de4ad7853244e95 Mon Sep 17 00:00:00 2001
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From: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
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Date: Sat, 25 Feb 2017 15:58:22 +0000
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Subject: mtd: nand: Check length of ID before reading bits per cell
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The table-based NAND identification currently reads the number
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of bits per cell from the 3rd byte of the extended ID. This is done
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for the so-called 'full ID' devices; i.e. devices that have a known
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length ID.
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However, if the ID length is shorter than three, there's no 3rd byte,
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and so it's wrong to read the bits per cell from there. Fix this by
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adding a check for the ID length.
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(picked from http://lists.infradead.org/pipermail/linux-mtd/2014-December/056764.html)
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Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
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---
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drivers/mtd/nand/nand_base.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/mtd/nand/nand_base.c
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+++ b/drivers/mtd/nand/nand_base.c
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2017-12-06 22:51:31 +00:00
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@@ -4043,7 +4043,8 @@ static bool find_full_id_nand(struct mtd
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2017-02-15 09:05:24 +00:00
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mtd->erasesize = type->erasesize;
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mtd->oobsize = type->oobsize;
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- chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
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+ if (type->id_len > 2)
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+ chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
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chip->chipsize = (uint64_t)type->chipsize << 20;
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chip->options |= type->options;
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chip->ecc_strength_ds = NAND_ECC_STRENGTH(type);
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