Commit e7de4b49 authored by Dan Carpenter's avatar Dan Carpenter Committed by Felix Fietkau
Browse files

wifi: mt76: mt7921: fix use after free in mt7921_acpi_read() 



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

Fixes: f965333e ("mt76: mt7921: introduce ACPI SAR support")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
parent b5ee771c

drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c

+4 −1
Original line number Diff line number Diff line
@@ -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 */