[alsa-devel] [PATCH 3/8] ASoC: SOF: loader: fix snd_sof_fw_parse_ext_data

[Pierre-Louis Bossart]

From: Karol Trzcinski <karolx.trzcinski at linux.intel.com>

An error occurs during parsing more than one ext_data from the mailbox, because
of invalid data offset handling. Fix by removing the incorrect duplicate
increment of the offset.

The return value is also reset in the switch case. This does not change the
behavior but improves readability - there is no longer a need to check what the
return value of get_ext_windows is.

Signed-off-by: Karol Trzcinski <karolx.trzcinski at linux.intel.com>
Signed-off-by: Bartosz Kokoszko <bartoszx.kokoszko at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/sof/loader.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/loader.c b/sound/soc/sof/loader.c
index a041adf0669d..432d12bd4937 100644
--- a/sound/soc/sof/loader.c
+++ b/sound/soc/sof/loader.c
@@ -50,8 +50,7 @@ int snd_sof_fw_parse_ext_data(struct snd_sof_dev *sdev, u32 bar, u32 offset)
 
 	while (ext_hdr->hdr.cmd == SOF_IPC_FW_READY) {
 		/* read in ext structure */
-		offset += sizeof(*ext_hdr);
-		snd_sof_dsp_block_read(sdev, bar, offset,
+		snd_sof_dsp_block_read(sdev, bar, offset + sizeof(*ext_hdr),
 				   (void *)((u8 *)ext_data + sizeof(*ext_hdr)),
 				   ext_hdr->hdr.size - sizeof(*ext_hdr));
 
@@ -61,6 +60,7 @@ int snd_sof_fw_parse_ext_data(struct snd_sof_dev *sdev, u32 bar, u32 offset)
 		/* process structure data */
 		switch (ext_hdr->type) {
 		case SOF_IPC_EXT_DMA_BUFFER:
+			ret = 0;
 			break;
 		case SOF_IPC_EXT_WINDOW:
 			ret = get_ext_windows(sdev, ext_hdr);
@@ -68,6 +68,7 @@ int snd_sof_fw_parse_ext_data(struct snd_sof_dev *sdev, u32 bar, u32 offset)
 		default:
 			dev_warn(sdev->dev, "warning: unknown ext header type %d size 0x%x\n",
 				 ext_hdr->type, ext_hdr->hdr.size);
+			ret = 0;
 			break;
 		}
 
-- 
2.20.1