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

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

Fixes: f965333e49 ("mt76: mt7921: introduce ACPI SAR support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Dan Carpenter
2022-07-22 09:37:07 +03:00
committed by Felix Fietkau
parent b5ee771c84
commit e7de4b4979
1 changed files with 4 additions and 1 deletions
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5
drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
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@@ -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 */