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soundwire: cadence_master: check the number of bidir PDIs

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There is an assumption that the first two PDIs are reserved for Bulk,
so we need to make sure the number of bidir PDIs is indeed larger than
two. If the configuration provided is incorrect, this could lead to
allocating a huge amount of memory.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2019-05-22 14:47:28 -05:00 committed by Vinod Koul
parent a78b32d9c3
commit 2d35526df9
1 changed files with 2 additions and 0 deletions
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2
drivers/soundwire/cadence_master.c
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@ -718,6 +718,8 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
stream = &cdns->pcm;
/* First two PDIs are reserved for bulk transfers */
if (stream->num_bd < CDNS_PCM_PDI_OFFSET)
return -EINVAL;
stream->num_bd -= CDNS_PCM_PDI_OFFSET;
offset = CDNS_PCM_PDI_OFFSET;