linux-kernel - [PATCH] drivers: firmware: xilinx: Fix dereferencing freed memory

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Date:   Sun, 7 Feb 2021 22:31:23 -0800
From:   Rajan Vaja <rajan.vaja@...inx.com>
To:     <amit.sunil.dhamne@...inx.com>, <michal.simek@...inx.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Tejas Patel <tejas.patel@...inx.com>,
        Rajan Vaja <rajan.vaja@...inx.com>
Subject: [PATCH] drivers: firmware: xilinx: Fix dereferencing freed memory

From: Tejas Patel <tejas.patel@...inx.com>

Fix smatch warning:
drivers/firmware/xilinx/zynqmp.c:1288 zynqmp_firmware_remove()
error: dereferencing freed memory 'feature_data'

Use hash_for_each_safe for safe removal of hash entry.

Fixes: acfdd18591ea ("firmware: xilinx: Use hash-table for api feature check")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Tejas Patel <tejas.patel@...inx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 7eb9958..83082e2 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -2,7 +2,7 @@
 /*
  * Xilinx Zynq MPSoC Firmware layer
  *
- *  Copyright (C) 2014-2020 Xilinx, Inc.
+ *  Copyright (C) 2014-2021 Xilinx, Inc.
  *
  *  Michal Simek <michal.simek@...inx.com>
  *  Davorin Mista <davorin.mista@...ios.com>
@@ -1280,12 +1280,13 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
 static int zynqmp_firmware_remove(struct platform_device *pdev)
 {
 	struct pm_api_feature_data *feature_data;
+	struct hlist_node *tmp;
 	int i;
 
 	mfd_remove_devices(&pdev->dev);
 	zynqmp_pm_api_debugfs_exit();
 
-	hash_for_each(pm_api_features_map, i, feature_data, hentry) {
+	hash_for_each_safe(pm_api_features_map, i, tmp, feature_data, hentry) {
 		hash_del(&feature_data->hentry);
 		kfree(feature_data);
 	}
-- 
2.7.4