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ASoC: Intel: Skylake: Fix the memory overwrite of tlv buffer 

TLV buffer can be smaller than the module data, so update the
size of data to be copied before doing the copy.

Also TLV header consists of two unsigned ints, this is also taken
into account here and size modified to reflect this

Suggested-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vinod Koul 2016-02-03 17:59:44 +05:30 committed by Mark Brown
parent 292d4200a9
commit 41556f68d1
1 changed files with 7 additions and 0 deletions
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7
sound/soc/intel/skylake/skl-topology.c
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@ -916,6 +916,13 @@ static int skl_tplg_tlv_control_get(struct snd_kcontrol *kcontrol,
skl_get_module_params(skl->skl_sst, (u32 *)bc->params,
bc->max, bc->param_id, mconfig);
/* decrement size for TLV header */
size -= 2 * sizeof(u32);
/* check size as we don't want to send kernel data */
if (size > bc->max)
size = bc->max;
if (bc->params) {
if (copy_to_user(data, &bc->param_id, sizeof(u32)))
return -EFAULT;