As part of the work to perform bounds checking on all memcpy() uses, replace the open-coded a deserialization of bytes out of memory into a trailing flexible array by using a flex_array.h helper to perform the allocation, bounds checking, and copying.
Cc: Lars-Peter Clausen <l...@metafoo.de> Cc: "Nuno Sá" <nuno...@analog.com> Cc: Liam Girdwood <lgirdw...@gmail.com> Cc: Mark Brown <broo...@kernel.org> Cc: Jaroslav Kysela <pe...@perex.cz> Cc: Takashi Iwai <ti...@suse.com> Cc: alsa-de...@alsa-project.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- sound/soc/codecs/sigmadsp.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/sound/soc/codecs/sigmadsp.c b/sound/soc/codecs/sigmadsp.c index b992216aee55..648bdc73c5d9 100644 --- a/sound/soc/codecs/sigmadsp.c +++ b/sound/soc/codecs/sigmadsp.c @@ -42,8 +42,8 @@ struct sigmadsp_data { struct list_head head; uint32_t samplerates; unsigned int addr; - unsigned int length; - uint8_t data[]; + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(unsigned int, length); + DECLARE_FLEX_ARRAY_ELEMENTS(uint8_t, data); }; struct sigma_fw_chunk { @@ -263,7 +263,7 @@ static int sigma_fw_load_data(struct sigmadsp *sigmadsp, const struct sigma_fw_chunk *chunk, unsigned int length) { const struct sigma_fw_chunk_data *data_chunk; - struct sigmadsp_data *data; + struct sigmadsp_data *data = NULL; if (length <= sizeof(*data_chunk)) return -EINVAL; @@ -272,14 +272,11 @@ static int sigma_fw_load_data(struct sigmadsp *sigmadsp, length -= sizeof(*data_chunk); - data = kzalloc(sizeof(*data) + length, GFP_KERNEL); - if (!data) + if (mem_to_flex_dup(&data, data_chunk->data, length, GFP_KERNEL)) return -ENOMEM; data->addr = le16_to_cpu(data_chunk->addr); - data->length = length; data->samplerates = le32_to_cpu(chunk->samplerates); - memcpy(data->data, data_chunk->data, length); list_add_tail(&data->head, &sigmadsp->data_list); return 0; -- 2.32.0