* [PATCH] ASoC: sigmadsp: Use flexible array for control cache
@ 2026-05-11 23:03 Rosen Penev
0 siblings, 0 replies; only message in thread
From: Rosen Penev @ 2026-05-11 23:03 UTC (permalink / raw)
To: linux-sound
Cc: Lars-Peter Clausen, Nuno Sá, Liam Girdwood, Mark Brown,
Jaroslav Kysela, Takashi Iwai, Kees Cook, Gustavo A. R. Silva,
open list,
open list:KERNEL HARDENING (not covered by other areas):Keyword:b__counted_by(_le|_be)?b
Allocate SigmaDSP controls with kzalloc_flex() for the trailing
cache data instead of open-coding the size calculation.
Annotate the cache array with its existing byte count so the allocation
helper can initialize the counter.
Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
sound/soc/codecs/sigmadsp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/sigmadsp.c b/sound/soc/codecs/sigmadsp.c
index 3343dbb63d2b..2e08fde3989c 100644
--- a/sound/soc/codecs/sigmadsp.c
+++ b/sound/soc/codecs/sigmadsp.c
@@ -35,7 +35,7 @@ struct sigmadsp_control {
struct snd_kcontrol *kcontrol;
bool is_readback;
bool cached;
- uint8_t cache[];
+ u8 cache[] __counted_by(num_bytes);
};
struct sigmadsp_data {
@@ -223,7 +223,7 @@ static int sigma_fw_load_control(struct sigmadsp *sigmadsp,
return -EINVAL;
num_bytes = le16_to_cpu(ctrl_chunk->num_bytes);
- ctrl = kzalloc(sizeof(*ctrl) + num_bytes, GFP_KERNEL);
+ ctrl = kzalloc_flex(*ctrl, cache, num_bytes);
if (!ctrl)
return -ENOMEM;
--
2.54.0
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