6.9-stable review patch. If anyone has any objections, please let me know.
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From: Richard Fitzgerald rf@opensource.cirrus.com
[ 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@opensource.cirrus.com Fixes: f6bc909e7673 ("firmware: cs_dsp: add driver to support firmware loading on Cirrus Logic DSPs") Link: https://patch.msgid.link/20240708144855.385332-1-rf@opensource.cirrus.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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);