Commit d62f4bc6 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: wm_asdp: Validate sanity of algorithm count 



If we run into I/O problems the algorithm count may be crazy, validate it
before we proceed and dump the read data for diagnostic purposes.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 45b9ee72

sound/soc/codecs/wm_adsp.c

+15 −2
Original line number Diff line number Diff line
@@ -377,10 +377,10 @@ static int wm_adsp_setup_algs(struct wm_adsp *dsp) 
	struct wmfw_adsp2_id_hdr adsp2_id;

	struct wmfw_adsp1_alg_hdr *adsp1_alg;

	struct wmfw_adsp2_alg_hdr *adsp2_alg;

	void *alg;

	void *alg, *buf;

	const struct wm_adsp_region *mem;

	unsigned int pos, term;

	size_t algs;

	size_t algs, buf_size;

	__be32 val;

	int i, ret;
@@ -411,6 +411,9 @@ static int wm_adsp_setup_algs(struct wm_adsp *dsp) 
			return ret;

		}



		buf = &adsp1_id;

		buf_size = sizeof(adsp1_id);



		algs = be32_to_cpu(adsp1_id.algs);

		adsp_info(dsp, "Firmware: %x v%d.%d.%d, %zu algorithms\n",

			  be32_to_cpu(adsp1_id.fw.id),
@@ -432,6 +435,9 @@ static int wm_adsp_setup_algs(struct wm_adsp *dsp) 
			return ret;

		}



		buf = &adsp2_id;

		buf_size = sizeof(adsp2_id);



		algs = be32_to_cpu(adsp2_id.algs);

		adsp_info(dsp, "Firmware: %x v%d.%d.%d, %zu algorithms\n",

			  be32_to_cpu(adsp2_id.fw.id),
@@ -454,6 +460,13 @@ static int wm_adsp_setup_algs(struct wm_adsp *dsp) 
		return -EINVAL;

	}



	if (algs > 1024) {

		adsp_err(dsp, "Algorithm count %zx excessive\n", algs);

		print_hex_dump_bytes(dev_name(dsp->dev), DUMP_PREFIX_OFFSET,

				     buf, buf_size);

		return -EINVAL;

	}



	/* Read the terminator first to validate the length */

	ret = regmap_raw_read(regmap, mem->base + term, &val, sizeof(val));

	if (ret != 0) {