From: Yang Yingliang yangyingliang@huawei.com
stable inclusion from stable-v4.19.315 commit a7182993dd8e09f96839ddc3ac54f9b37370d282 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4OY CVE: CVE-2021-47409
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v...
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[ Upstream commit 856e6e8e0f9300befa87dde09edb578555c99a82 ]
It will cause null-ptr-deref if platform_get_resource() returns NULL, we need check the return value.
Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://lore.kernel.org/r/20210831084236.1359677-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wenyu Huang huangwenyu5@huawei.com --- drivers/usb/dwc2/hcd.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index a5c8329fd462..de9b6a640def 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -5233,6 +5233,10 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg) hcd->has_tt = 1;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + retval = -EINVAL; + goto error1; + } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res);