6.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
[ Upstream commit 680e126ec0400f6daecf0510c5bb97a55779ff03 ]
Use strnlen() instead of strlen() on the algorithm and coefficient name
string arrays in V1 wmfw files.
In V1 wmfw files the name is a NUL-terminated string in a fixed-size
array. cs_dsp should protect against overrunning the array if the NUL
terminator is missing.
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/20240708144855.385332-1-rf@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/firmware/cirrus/cs_dsp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/cirrus/cs_dsp.c b/drivers/firmware/cirrus/cs_dsp.c
index b6fd2ea1ce643..a1da7581adb03 100644
--- a/drivers/firmware/cirrus/cs_dsp.c
+++ b/drivers/firmware/cirrus/cs_dsp.c
@@ -1128,7 +1128,7 @@ static int cs_dsp_coeff_parse_alg(struct cs_dsp *dsp,
blk->id = le32_to_cpu(raw->id);
blk->name = raw->name;
- blk->name_len = strlen(raw->name);
+ blk->name_len = strnlen(raw->name, ARRAY_SIZE(raw->name));
blk->ncoeff = le32_to_cpu(raw->ncoeff);
pos = sizeof(*raw);
@@ -1204,7 +1204,7 @@ static int cs_dsp_coeff_parse_coeff(struct cs_dsp *dsp,
return -EOVERFLOW;
blk->name = raw->name;
- blk->name_len = strlen(raw->name);
+ blk->name_len = strnlen(raw->name, ARRAY_SIZE(raw->name));
blk->ctl_type = le16_to_cpu(raw->ctl_type);
blk->flags = le16_to_cpu(raw->flags);
blk->len = le32_to_cpu(raw->len);
--
2.43.0
