linux-kernel - [PATCH] usb: cdnsp: Fix segmentation fault in cdns_lost

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Message-ID: <20220111090737.10345-1-pawell@gli-login.cadence.com>
Date:   Tue, 11 Jan 2022 10:07:37 +0100
From:   Pawel Laszczak <pawell@...ence.com>
To:     <peter.chen@...nel.org>
CC:     <a-govindraju@...com>, <frank.li@....com>, <rogerq@...nel.org>,
        <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <pawell@...ence.com>,
        <stable@...r.kernel.org>
Subject: [PATCH] usb: cdnsp: Fix segmentation fault in cdns_lost_power function

From: Pawel Laszczak <pawell@...ence.com>

CDNSP driver read not initialized cdns->otg_v0_regs
which lead to segmentation fault. Patch fixes this issue.

Fixes: 2cf2581cd229 ("usb: cdns3: add power lost support for system resume")
cc: <stable@...r.kernel.org>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
---
 drivers/usb/cdns3/drd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
index 55c73b1d8704..d00ff98dffab 100644
--- a/drivers/usb/cdns3/drd.c
+++ b/drivers/usb/cdns3/drd.c
@@ -483,11 +483,11 @@ int cdns_drd_exit(struct cdns *cdns)
 /* Indicate the cdns3 core was power lost before */
 bool cdns_power_is_lost(struct cdns *cdns)
 {
-	if (cdns->version == CDNS3_CONTROLLER_V1) {
-		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))
+	if (cdns->version == CDNS3_CONTROLLER_V0) {
+		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))
 			return true;
 	} else {
-		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))
+		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))
 			return true;
 	}
 	return false;
-- 
2.25.1