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ASoC: qdsp6: fix a use after free bug in open() 

This code frees "graph" and then dereferences to save the error code.
Save the error code first and then use gotos to unwind the allocation.

Fixes: 59716aa3f9 ("ASoC: qdsp6: Fix an IS_ERR() vs NULL bug")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20211217150007.GB16611@kili
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dan Carpenter 2021-12-17 18:00:07 +03:00 committed by Mark Brown
parent 2dc643cd75
commit ac1e6bc146
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GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 4 deletions
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10
sound/soc/qcom/qdsp6/q6apm.c
View File

@ -615,7 +615,7 @@ struct q6apm_graph *q6apm_graph_open(struct device *dev, q6apm_cb cb,
graph = kzalloc(sizeof(*graph), GFP_KERNEL);
if (!graph) {
ret = -ENOMEM;
goto err;
goto put_ar_graph;
}
graph->apm = apm;
@ -631,13 +631,15 @@ struct q6apm_graph *q6apm_graph_open(struct device *dev, q6apm_cb cb,
graph->port = gpr_alloc_port(apm->gdev, dev, graph_callback, graph);
if (IS_ERR(graph->port)) {
kfree(graph);
ret = PTR_ERR(graph->port);
goto err;
goto free_graph;
}
return graph;
err:
free_graph:
kfree(graph);
put_ar_graph:
kref_put(&ar_graph->refcount, q6apm_put_audioreach_graph);
return ERR_PTR(ret);
}