From ab5a6208b4d6872b1c6ecea1867940fc668cc76d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Amadeusz=20S=C5=82awi=C5=84ski?= Date: Mon, 3 Jun 2024 12:28:15 +0200 Subject: [PATCH] ASoC: topology: Fix references to freed memory MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ Upstream commit 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 Link: https://github.com/thesofproject/avs-topology-xml/issues/22#issuecomment-2127892605 Reviewed-by: Cezary Rojewski Signed-off-by: Amadeusz Sławiński Link: https://lore.kernel.org/r/20240603102818.36165-2-amadeuszx.slawinski@linux.intel.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/soc-topology.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c index 2362c282ec8b..c63545b27d45 100644 --- a/sound/soc/soc-topology.c +++ b/sound/soc/soc-topology.c @@ -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;