From 294cbbf1753e95ac9d19a5a46102b79717312c61 Mon Sep 17 00:00:00 2001 From: Zhao Liu Date: Fri, 23 Feb 2024 16:56:49 +0800 Subject: hw/mem/cxl_type3: Fix missing ERRP_GUARD() in ct3_realize() As the comment in qapi/error, dereferencing @errp requires ERRP_GUARD(): * = Why, when and how to use ERRP_GUARD() = * * Without ERRP_GUARD(), use of the @errp parameter is restricted: * - It must not be dereferenced, because it may be null. ... * ERRP_GUARD() lifts these restrictions. * * To use ERRP_GUARD(), add it right at the beginning of the function. * @errp can then be used without worrying about the argument being * NULL or &error_fatal. * * Using it when it's not needed is safe, but please avoid cluttering * the source with useless code. But in ct3_realize(), @errp is dereferenced without ERRP_GUARD(): cxl_doe_cdat_init(cxl_cstate, errp); if (*errp) { goto err_free_special_ops; } Here we check *errp, because cxl_doe_cdat_init() returns void. And ct3_realize() - as a PCIDeviceClass.realize() method - doesn't get the NULL @errp parameter, it hasn't triggered the bug that dereferencing the NULL @errp. To follow the requirement of @errp, add missing ERRP_GUARD() in ct3_realize(). Suggested-by: Markus Armbruster Signed-off-by: Zhao Liu Reviewed-by: Markus Armbruster Message-ID: <20240223085653.1255438-4-zhao1.liu@linux.intel.com> Signed-off-by: Thomas Huth --- hw/mem/cxl_type3.c | 1 + 1 file changed, 1 insertion(+) (limited to 'hw') diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c index b679dfa..b0a7e9f 100644 --- a/hw/mem/cxl_type3.c +++ b/hw/mem/cxl_type3.c @@ -645,6 +645,7 @@ static DOEProtocol doe_cdat_prot[] = { static void ct3_realize(PCIDevice *pci_dev, Error **errp) { + ERRP_GUARD(); CXLType3Dev *ct3d = CXL_TYPE3(pci_dev); CXLComponentState *cxl_cstate = &ct3d->cxl_cstate; ComponentRegisters *regs = &cxl_cstate->crb; -- cgit v1.1