linux-kernel - [PATCH 1/1] [v2] drivers: edac: Fix bad bit shift operations

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Date:   Wed, 13 Apr 2022 10:17:54 +0530
From:   Priyanka Singh <priyanka.singh@....com>
To:     york.sun@....com, bp@...en8.de, mchehab@...nel.org,
        tony.luck@...el.com, james.morse@....com, rric@...nel.org
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        priyanka.jain@....com, jaiprakash.singh@....com,
        rajan.gupta@....com, rajesh.bhagat@....com,
        Priyanka Singh <priyanka.singh@....com>
Subject: [PATCH 1/1] [v2] drivers: edac: Fix bad bit shift operations

Fix possible bad bit shift operations in fsl_mc_check()

Signed-off-by: Priyanka Singh <priyanka.singh@....com>
Reviewed-by: Sherry Sun <sherry.sun@....com>
Reported-by: kernel test robot <lkp@...el.com>
---
Changes for v2:
     Fixed compilation warning

 drivers/edac/fsl_ddr_edac.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/edac/fsl_ddr_edac.c b/drivers/edac/fsl_ddr_edac.c
index 6d8ea226010d..747c52b019a2 100644
--- a/drivers/edac/fsl_ddr_edac.c
+++ b/drivers/edac/fsl_ddr_edac.c
@@ -6,7 +6,7 @@
  * split out from mpc85xx_edac EDAC driver.
  *
  * Parts Copyrighted (c) 2013 by Freescale Semiconductor, Inc.
- *
+ * Parts Copyrighted (c) 2022 NXP
  * Author: Dave Jiang <djiang@...sta.com>
  *
  * 2006-2007 (c) MontaVista Software, Inc. This file is licensed under
@@ -334,18 +334,24 @@ static void fsl_mc_check(struct mem_ctl_info *mci)
 		sbe_ecc_decode(cap_high, cap_low, syndrome,
 				&bad_data_bit, &bad_ecc_bit);
 
-		if (bad_data_bit != -1)
+		if (bad_data_bit >= 0)
 			fsl_mc_printk(mci, KERN_ERR,
 				"Faulty Data bit: %d\n", bad_data_bit);
-		if (bad_ecc_bit != -1)
+		if (bad_ecc_bit >= 0)
 			fsl_mc_printk(mci, KERN_ERR,
-				"Faulty ECC bit: %d\n", bad_ecc_bit);
-
-		fsl_mc_printk(mci, KERN_ERR,
-			"Expected Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
-			cap_high ^ (1 << (bad_data_bit - 32)),
-			cap_low ^ (1 << bad_data_bit),
-			syndrome ^ (1 << bad_ecc_bit));
+					"Faulty ECC bit: %d\n", bad_ecc_bit);
+		if ((bad_data_bit > 0 && bad_data_bit < 32) && bad_ecc_bit > 0) {
+			fsl_mc_printk(mci, KERN_ERR,
+				"Expected Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
+				cap_high, cap_low ^ (1 << bad_data_bit),
+				syndrome ^ (1 << bad_ecc_bit));
+		}
+		if (bad_data_bit >= 32 && bad_ecc_bit > 0) {
+			fsl_mc_printk(mci, KERN_ERR,
+				"Expected Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
+				cap_high ^ (1 << (bad_data_bit - 32)),
+				cap_low, syndrome ^ (1 << bad_ecc_bit));
+		}
 	}
 
 	fsl_mc_printk(mci, KERN_ERR,

base-commit: f6695af7ac79f92d80a7c20fc86a236d1784562f
-- 
2.17.1