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platform/x86: dell-smbios-wmi: Add missing kfree in error-exit from run_smbios_call 

[ Upstream commit 0487d4fc42d7f31a56cfd9e2237f9ebd889e6112 ]

As pointed out be Kees Cook if we return -EIO because the
obj->type != ACPI_TYPE_BUFFER, then we must kfree the
output buffer before the return.

Fixes: 1a258e6704 ("platform/x86: dell-smbios-wmi: Add new WMI dispatcher driver")
Reported-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210826140822.71198-1-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans de Goede 2021-08-26 16:08:22 +02:00 committed by Greg Kroah-Hartman
parent ba5d4dc003
commit e2e3758a2c
1 changed files with 1 additions and 0 deletions
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drivers/platform/x86/dell-smbios-wmi.c
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@ -69,6 +69,7 @@ static int run_smbios_call(struct wmi_device *wdev)
if (obj->type == ACPI_TYPE_INTEGER)
dev_dbg(&wdev->dev, "SMBIOS call failed: %llu\n",
obj->integer.value);
kfree(output.pointer);
return -EIO;
}
memcpy(&priv->buf->std, obj->buffer.pointer, obj->buffer.length);