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ASoC: topology: Prevent use-after-free in snd_soc_get_pcm_runtime() 

[ Upstream commit dd836ddf4e ]

remove_link() is currently calling snd_soc_remove_dai_link() after
it has already freed the memory for the link name. But this is later
read from snd_soc_get_pcm_runtime() causing a KASAN use-after-free
warning. Reorder the cleanups to fix this issue.

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/20191204210447.11701-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dragos Tarcatu 2019-12-04 15:04:47 -06:00 committed by Greg Kroah-Hartman
parent 68b74847c8
commit 98aedb8935
1 changed files with 3 additions and 3 deletions
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6
sound/soc/soc-topology.c
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@ -548,12 +548,12 @@ static void remove_link(struct snd_soc_component *comp,
if (dobj->ops && dobj->ops->link_unload)
dobj->ops->link_unload(comp, dobj);
list_del(&dobj->list);
snd_soc_remove_dai_link(comp->card, link);
kfree(link->name);
kfree(link->stream_name);
kfree(link->cpus->dai_name);
list_del(&dobj->list);
snd_soc_remove_dai_link(comp->card, link);
kfree(link);
}