linux-kernel - [PATCH 6.0 281/862] wifi: mt76: mt7921: fix use after free in mt7921_acpi

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Date:   Wed, 19 Oct 2022 10:26:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 281/862] wifi: mt76: mt7921: fix use after free in mt7921_acpi_read()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit e7de4b4979bd8d313ec837931dde936653ca82ea ]

Don't dereference "sar_root" after it has been freed.

Fixes: f965333e491e ("mt76: mt7921: introduce ACPI SAR support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
index be4f07ad3af9..47e034a9b003 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
@@ -13,6 +13,7 @@ mt7921_acpi_read(struct mt7921_dev *dev, u8 *method, u8 **tbl, u32 *len)
 	acpi_handle root, handle;
 	acpi_status status;
 	u32 i = 0;
+	int ret;
 
 	root = ACPI_HANDLE(mdev->dev);
 	if (!root)
@@ -52,9 +53,11 @@ mt7921_acpi_read(struct mt7921_dev *dev, u8 *method, u8 **tbl, u32 *len)
 		*(*tbl + i) = (u8)sar_unit->integer.value;
 	}
 free:
+	ret = (i == sar_root->package.count) ? 0 : -EINVAL;
+
 	kfree(sar_root);
 
-	return (i == sar_root->package.count) ? 0 : -EINVAL;
+	return ret;
 }
 
 /* MTCL : Country List Table for 6G band */
-- 
2.35.1