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swtpm: Fix case when no backend URI has been specified

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It is possible to start swtpm with this command line even though
neither storage nor communication channels have been provided.

./src/swtpm/swtpm socket --flags not-need-init,startup-clear

Since sending a startup message to the TPM will cause it to
want to store permanent state, we have to handle the case when
no storage backend was given and therefore the backend_uri
is NULL.

Previously the above command line caused a NULL pointer exception
but now handles this case with the following output:

swtpm: SWTPM_NVRAM_Init: Missing backend URI.
swtpm: Error: Could not initialize libtpms.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Stefan Berger 2021-10-12 06:27:26 -04:00 committed by Stefan Berger
parent 0151ec3a52
commit 57b1f7ef88
1 changed files with 5 additions and 1 deletions
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6
src/swtpm/swtpm_nvstore.c
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@ -179,7 +179,11 @@ TPM_RESULT SWTPM_NVRAM_Init(void)
TPM_DEBUG(" SWTPM_NVRAM_Init:\n");
backend_uri = tpmstate_get_backend_uri();
if (strncmp(backend_uri, "dir://", 6) == 0) {
if (!backend_uri) {
logprintf(STDERR_FILENO,
"SWTPM_NVRAM_Init: Missing backend URI.\n");
rc = TPM_FAIL;
} else if (strncmp(backend_uri, "dir://", 6) == 0) {
g_nvram_backend_ops = &nvram_dir_ops;
} else if (strncmp(backend_uri, "file://", 7) == 0) {
g_nvram_backend_ops = &nvram_linear_ops;