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efi: ssdt: Don't free memory if ACPI table was loaded successfully

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Amadeusz reports KASAN use-after-free errors introduced by commit
3881ee0b1e ("efi: avoid efivars layer when loading SSDTs from
variables"). The problem appears to be that the memory that holds the
new ACPI table is now freed unconditionally, instead of only when the
ACPI core reported a failure to load the table.

So let's fix this, by omitting the kfree() on success.

Cc: <stable@vger.kernel.org> # v6.0
Link: https://lore.kernel.org/all/a101a10a-4fbb-5fae-2e3c-76cf96ed8fbd@linux.intel.com/
Fixes: 3881ee0b1e ("efi: avoid efivars layer when loading SSDTs from variables")
Reported-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-10-14 12:25:52 +02:00
parent f57fb375a2
commit 4b017e59f0
1 changed files with 2 additions and 0 deletions
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2
drivers/firmware/efi/efi.c
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@ -271,6 +271,8 @@ static __init int efivar_ssdt_load(void)
acpi_status ret = acpi_load_table(data, NULL);
if (ret)
pr_err("failed to load table: %u\n", ret);
else
continue;
} else {
pr_err("failed to get var data: 0x%lx\n", status);
}