soc: samsung: exynos-chipid: Add NULL pointer check in exynos_chipid_probe()

[ Upstream commit c8222ef6cf29dd7cad21643228f96535cc02b327 ]

soc_dev_attr->revision could be NULL, thus,
a pointer check is added to prevent potential NULL pointer dereference.
This is similar to the fix in commit 3027e7b15b02
("ice: Fix some null pointer dereference issues in ice_ptp.c").

This issue is found by our static analysis tool.

Signed-off-by: Chenyuan Yang <chenyuan0y@gmail.com>
Link: https://lore.kernel.org/r/20250212213518.69432-1-chenyuan0y@gmail.com
Fixes: 3253b7b7cd44 ("soc: samsung: Add exynos chipid driver support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
index a2d163a1b4e1101fd9caa33c50e5086fd576c07c..fb9e80b63b917cd49cfb8c8ca1457aea263ea8fe 100644 (file)
--- a/drivers/soc/samsung/exynos-chipid.c
+++ b/drivers/soc/samsung/exynos-chipid.c
@@ -124,6 +124,8 @@ static int exynos_chipid_probe(struct platform_device *pdev)
 
        soc_dev_attr->revision = devm_kasprintf(&pdev->dev, GFP_KERNEL,
                                                "%x", soc_info.revision);
+       if (!soc_dev_attr->revision)
+               return -ENOMEM;
        soc_dev_attr->soc_id = product_id_to_soc_id(soc_info.product_id);
        if (!soc_dev_attr->soc_id) {
                pr_err("Unknown SoC\n");