Commit d952767d authored Jul 30, 2024 by Amadeusz Sławiński Committed by Zheng Yejian Jul 30, 2024

ASoC: topology: Fix references to freed memory

mainline inclusion
from mainline-v6.10-rc6
commit 97ab304ecd95c0b1703ff8c8c3956dc6e2afe8e1
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAGELE
CVE: CVE-2024-41069

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=97ab304ecd95c0b1703ff8c8c3956dc6e2afe8e1



--------------------------------

Most users after parsing a topology file, release memory used by it, so
having pointer references directly into topology file contents is wrong.
Use devm_kmemdup(), to allocate memory as needed.

Reported-by: Jason Montleon <jmontleo@redhat.com>
Link: https://github.com/thesofproject/avs-topology-xml/issues/22#issuecomment-2127892605


Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/20240603102818.36165-2-amadeuszx.slawinski@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>
Fixes: 8a978234 ("ASoC: topology: Add topology core")
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>

parent 3e3fceae

sound/soc/soc-topology.c

+22 −5

Original line number	Diff line number	Diff line
		@@ -1060,15 +1060,32 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg,
		break;
		}

		route->source = elem->source;
		route->sink = elem->sink;
		route->source = devm_kmemdup(tplg->dev, elem->source,
		min(strlen(elem->source),
		SNDRV_CTL_ELEM_ID_NAME_MAXLEN),
		GFP_KERNEL);
		route->sink = devm_kmemdup(tplg->dev, elem->sink,
		min(strlen(elem->sink), SNDRV_CTL_ELEM_ID_NAME_MAXLEN),
		GFP_KERNEL);
		if (!route->source \|\| !route->sink) {
		ret = -ENOMEM;
		break;
		}

		/* set to NULL atm for tplg users */
		route->connected = NULL;
		if (strnlen(elem->control, SNDRV_CTL_ELEM_ID_NAME_MAXLEN) == 0)
		if (strnlen(elem->control, SNDRV_CTL_ELEM_ID_NAME_MAXLEN) == 0) {
		route->control = NULL;
		else
		route->control = elem->control;
		} else {
		route->control = devm_kmemdup(tplg->dev, elem->control,
		min(strlen(elem->control),
		SNDRV_CTL_ELEM_ID_NAME_MAXLEN),
		GFP_KERNEL);
		if (!route->control) {
		ret = -ENOMEM;
		break;
		}
		}

		/* add route dobj to dobj_list */
		route->dobj.type = SND_SOC_DOBJ_GRAPH;