From e8069c66d09309579e53567be8ddfa6ccb2f452a Mon Sep 17 00:00:00 2001 From: Li Ming Date: Sat, 14 Mar 2026 15:06:33 +0800 Subject: [PATCH] cxl/pci: Check memdev driver binding status in cxl_reset_done() cxl_reset_done() accesses the endpoint of the corresponding CXL memdev without endpoint validity checking. By default, cxlmd->endpoint is initialized to -ENXIO, if cxl_reset_done() is triggered after the corresponding CXL memdev probing failed, this results in access to an invalid endpoint. CXL subsystem can always check CXL memdev driver binding status to confirm its endpoint validity. So adding the CXL memdev driver checking inside cxl_reset_done() to avoid accessing an invalid endpoint. Fixes: 934edcd436dc ("cxl: Add post-reset warning if reset results in loss of previously committed HDM decoders") Reviewed-by: Dan Williams Reviewed-by: Dave Jiang Signed-off-by: Li Ming Link: https://patch.msgid.link/20260314-fix_access_endpoint_without_drv_check-v2-4-4c09edf2e1db@zohomail.com Signed-off-by: Dave Jiang --- drivers/cxl/pci.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index fbb300a01830..a5922116db2a 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -1043,6 +1043,9 @@ static void cxl_reset_done(struct pci_dev *pdev) * that no longer exists. */ guard(device)(&cxlmd->dev); + if (!cxlmd->dev.driver) + return; + if (cxlmd->endpoint && cxl_endpoint_decoder_reset_detected(cxlmd->endpoint)) { dev_crit(dev, "SBR happened without memory regions removal.\n");