From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> stable inclusion from stable-v5.10.201 commit 5e5b85ea0f4bc484bfe4cc73ead51fa48d2366a0 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFK0 CVE: CVE-2023-52871 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit f1a1bc8775b26345aba2be278118999e7f661d3d ] Usually there is only one llcc device. But if there were a second, even a failed probe call would modify the global drv_data pointer. So check if drv_data is valid before overwriting it. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Fixes: a3134fb09e0b ("drivers: soc: Add LLCC driver") Link: https://lore.kernel.org/r/20230926083229.2073890-1-u.kleine-koenig@pengutron... Signed-off-by: Bjorn Andersson <andersson@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Conflicts: drivers/soc/qcom/llcc-slice.c Signed-off-by: Kaixiong Yu <yukaixiong@huawei.com> --- drivers/soc/qcom/llcc-slice.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c index 54063a31132f..3f1cac3145a4 100644 --- a/drivers/soc/qcom/llcc-slice.c +++ b/drivers/soc/qcom/llcc-slice.c @@ -283,6 +283,9 @@ int qcom_llcc_probe(struct platform_device *pdev, void __iomem *base; int ret, i; + if (!IS_ERR(drv_data)) + return -EBUSY; + drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL); if (!drv_data) return -ENOMEM; -- 2.25.1