Patch "ASoC: topology: Fix references to freed memory" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    ASoC: topology: Fix references to freed memory

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     asoc-topology-fix-references-to-freed-memory.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 43c9012820229c55a0397a57169419994ba3d41a
Author: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
Date:   Mon Jun 3 12:28:15 2024 +0200

    ASoC: topology: Fix references to freed memory
    
    [ 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 <jmontleo@xxxxxxxxxx>
    Link: https://github.com/thesofproject/avs-topology-xml/issues/22#issuecomment-2127892605
    Reviewed-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
    Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240603102818.36165-2-amadeuszx.slawinski@xxxxxxxxxxxxxxx
    Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index ba4890991f0d7..7add1dbf1d214 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;