6.1-stable review patch. If anyone has any objections, please let me know.
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From: Aleksandr Mishin amishin@t-argos.ru
[ Upstream commit f9f7f29f64454bb20896c7d918c3abc3a1aa487b ]
If IORESOURCE_MEM "lpass-rxtx-cdc-dma-lpm" or "lpass-va-cdc-dma-lpm" resources is not provided in Device Tree due to any error, platform_get_resource_byname() will return NULL which is later dereferenced. According to sound/qcom,lpass-cpu.yaml, these resources are provided, but DT can be broken due to any error. In such cases driver must be able to protect itself, since the DT is external data for the driver. Adjust this issues by adding NULL return check.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: b138706225c9 ("ASoC: qcom: Add regmap config support for codec dma driver") Signed-off-by: Aleksandr Mishin amishin@t-argos.ru Link: https://patch.msgid.link/20240605104953.12072-1-amishin@t-argos.ru Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/qcom/lpass-cpu.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c index dbdaaa85ce481..4387cca893c5d 100644 --- a/sound/soc/qcom/lpass-cpu.c +++ b/sound/soc/qcom/lpass-cpu.c @@ -1160,9 +1160,13 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev) }
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpass-rxtx-cdc-dma-lpm"); + if (!res) + return -EINVAL; drvdata->rxtx_cdc_dma_lpm_buf = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpass-va-cdc-dma-lpm"); + if (!res) + return -EINVAL; drvdata->va_cdc_dma_lpm_buf = res->start; }