powerpc/mpc8xxx: check SPD length before using part number

Only use DDR DIMM part number if SPD has valid length, to prevent from
display garbage in case SPD doesn't cover these fields.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c b/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
index 756b15f7ab0b088262373cebbf037b1419feefbd..838cebed5722c127506f0c292053433d48798330 100644 (file)
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
@@ -114,7 +114,8 @@ ddr_compute_dimm_parameters(const ddr3_spd_eeprom_t *spd,
         * and copying the part name in ASCII from the SPD onto it
         */
        memset(pdimm->mpart, 0, sizeof(pdimm->mpart));
-       memcpy(pdimm->mpart, spd->mpart, sizeof(pdimm->mpart) - 1);
+       if ((spd->info_size_crc & 0xF) > 1)
+               memcpy(pdimm->mpart, spd->mpart, sizeof(pdimm->mpart) - 1);
 
        /* DIMM organization parameters */
        pdimm->n_ranks = ((spd->organization >> 3) & 0x7) + 1;