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    Subject[PATCH v2 2/5] mtd: spi-nor: fix iteration over smpt array
    Date
    Iterate over smpt array using its starting address and length
    instead of the blind iterations that used data found in the array.

    This prevents possible memory accesses outside of the smpt array
    boundaries in case software, or manufacturers, misrepresent smpt
    array fields.

    Fixes: b038e8e3be72 ("mtd: spi-nor: parse SFDP Sector Map Parameter Table")
    Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
    Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
    ---
    v2: add Fixes tag, add a blank line

    drivers/mtd/spi-nor/spi-nor.c | 40 ++++++++++++++++++++++++++++++----------
    1 file changed, 30 insertions(+), 10 deletions(-)

    diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
    index 2cdf96013689..98e433e8e4c2 100644
    --- a/drivers/mtd/spi-nor/spi-nor.c
    +++ b/drivers/mtd/spi-nor/spi-nor.c
    @@ -2860,12 +2860,15 @@ static u8 spi_nor_smpt_read_dummy(const struct spi_nor *nor, const u32 settings)
    * spi_nor_get_map_in_use() - get the configuration map in use
    * @nor: pointer to a 'struct spi_nor'
    * @smpt: pointer to the sector map parameter table
    + * @smpt_len: sector map parameter table length
    */
    -static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
    +static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt,
    + u8 smpt_len)
    {
    const u32 *ret = NULL;
    - u32 i, addr;
    + u32 addr;
    int err;
    + u8 i;
    u8 addr_width, read_opcode, read_dummy;
    u8 read_data_mask, data_byte, map_id;

    @@ -2874,9 +2877,11 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
    read_opcode = nor->read_opcode;

    map_id = 0;
    - i = 0;
    /* Determine if there are any optional Detection Command Descriptors */
    - while (!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
    + for (i = 0; i < smpt_len; i += 2) {
    + if (smpt[i] & SMPT_DESC_TYPE_MAP)
    + break;
    +
    read_data_mask = SMPT_CMD_READ_DATA(smpt[i]);
    nor->addr_width = spi_nor_smpt_addr_width(nor, smpt[i]);
    nor->read_dummy = spi_nor_smpt_read_dummy(nor, smpt[i]);
    @@ -2892,18 +2897,33 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
    * Configuration that is currently in use.
    */
    map_id = map_id << 1 | !!(data_byte & read_data_mask);
    - i = i + 2;
    }

    - /* Find the matching configuration map */
    - while (SMPT_MAP_ID(smpt[i]) != map_id) {
    + /*
    + * If command descriptors are provided, they always precede map
    + * descriptors in the table. There is no need to start the iteration
    + * over smpt array all over again.
    + *
    + * Find the matching configuration map.
    + */
    + while (i < smpt_len) {
    + if (SMPT_MAP_ID(smpt[i]) == map_id) {
    + ret = smpt + i;
    + break;
    + }
    +
    + /*
    + * If there are no more configuration map descriptors and no
    + * configuration ID matched the configuration identifier, the
    + * sector address map is unknown.
    + */
    if (smpt[i] & SMPT_DESC_END)
    - goto out;
    + break;
    +
    /* increment the table index to the next map */
    i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
    }

    - ret = smpt + i;
    /* fall through */
    out:
    nor->addr_width = addr_width;
    @@ -3025,7 +3045,7 @@ static int spi_nor_parse_smpt(struct spi_nor *nor,
    for (i = 0; i < smpt_header->length; i++)
    smpt[i] = le32_to_cpu(smpt[i]);

    - sector_map = spi_nor_get_map_in_use(nor, smpt);
    + sector_map = spi_nor_get_map_in_use(nor, smpt, smpt_header->length);
    if (!sector_map) {
    ret = -EINVAL;
    goto out;
    --
    2.9.4
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