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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: f965333e491e ("mt76: mt7921: introduce ACPI SAR support")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Dan Carpenter
2022-09-15 13:12:37 +02:00
committed by Felix Fietkau
parent dee0a3cbfb
commit 9dd7be2c51
1 changed files with 4 additions and 1 deletions
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mt7921/acpi_sar.c
+4 -1
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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 */