6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
[ Upstream commit 6598afa9320b6ab13041616950ca5f8f938c0cf1 ]
Move the payload length check in cs_dsp_load() and cs_dsp_coeff_load()
to be done before the block is processed.
The check that the length of a block payload does not exceed the number
of remaining bytes in the firwmware file buffer was being done near the
end of the loop iteration. However, some code before that check used the
length field without validating it.
Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
Fixes: f6bc909e7673 ("firmware: cs_dsp: add driver to support firmware loading on Cirrus Logic DSPs")
Link: https://patch.msgid.link/20240627141432.93056-4-rf@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/firmware/cirrus/cs_dsp.c | 36 +++++++++++++-------------------
1 file changed, 15 insertions(+), 21 deletions(-)
diff --git a/drivers/firmware/cirrus/cs_dsp.c b/drivers/firmware/cirrus/cs_dsp.c
index 208c799af7968..7882f3a5f8556 100644
--- a/drivers/firmware/cirrus/cs_dsp.c
+++ b/drivers/firmware/cirrus/cs_dsp.c
@@ -1356,6 +1356,12 @@ static int cs_dsp_load(struct cs_dsp *dsp, const struct firmware *firmware,
}
region = (void *)&(firmware->data[pos]);
+
+ if (le32_to_cpu(region->len) > firmware->size - pos - sizeof(*region)) {
+ ret = -EOVERFLOW;
+ goto out_fw;
+ }
+
region_name = "Unknown";
reg = 0;
text = NULL;
@@ -1412,16 +1418,6 @@ static int cs_dsp_load(struct cs_dsp *dsp, const struct firmware *firmware,
regions, le32_to_cpu(region->len), offset,
region_name);
- if (le32_to_cpu(region->len) >
- firmware->size - pos - sizeof(*region)) {
- cs_dsp_err(dsp,
- "%s.%d: %s region len %d bytes exceeds file length %zu\n",
- file, regions, region_name,
- le32_to_cpu(region->len), firmware->size);
- ret = -EINVAL;
- goto out_fw;
- }
-
if (text) {
memcpy(text, region->data, le32_to_cpu(region->len));
cs_dsp_info(dsp, "%s: %s\n", file, text);
@@ -2051,6 +2047,11 @@ static int cs_dsp_load_coeff(struct cs_dsp *dsp, const struct firmware *firmware
blk = (void *)(&firmware->data[pos]);
+ if (le32_to_cpu(blk->len) > firmware->size - pos - sizeof(*blk)) {
+ ret = -EOVERFLOW;
+ goto out_fw;
+ }
+
type = le16_to_cpu(blk->type);
offset = le16_to_cpu(blk->offset);
version = le32_to_cpu(blk->ver) >> 8;
@@ -2146,17 +2147,6 @@ static int cs_dsp_load_coeff(struct cs_dsp *dsp, const struct firmware *firmware
}
if (reg) {
- if (le32_to_cpu(blk->len) >
- firmware->size - pos - sizeof(*blk)) {
- cs_dsp_err(dsp,
- "%s.%d: %s region len %d bytes exceeds file length %zu\n",
- file, blocks, region_name,
- le32_to_cpu(blk->len),
- firmware->size);
- ret = -EINVAL;
- goto out_fw;
- }
-
buf = cs_dsp_buf_alloc(blk->data,
le32_to_cpu(blk->len),
&buf_list);
@@ -2196,6 +2186,10 @@ static int cs_dsp_load_coeff(struct cs_dsp *dsp, const struct firmware *firmware
regmap_async_complete(regmap);
cs_dsp_buf_free(&buf_list);
kfree(text);
+
+ if (ret == -EOVERFLOW)
+ cs_dsp_err(dsp, "%s: file content overflows file data\n", file);
+
return ret;
}
--
2.43.0
