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tpm12: ubsan: prevent source address NULL passed to memcpy

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memcpy() is called with source address NULL, which causes an error
with ubsan. Coincidentally data_length is also 0, so nothing bad happens.
So we simply intercept the data_length = 0 case.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Stefan Berger 2018-11-23 19:21:54 -05:00 committed by Stefan Berger
parent 60c64ddaaf
commit 8b4944fec2
1 changed files with 4 additions and 2 deletions
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6
src/tpm12/tpm_store.c
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@ -257,8 +257,10 @@ TPM_RESULT TPM_Sbuffer_Append(TPM_STORE_BUFFER *sbuffer,
}
/* append the data */
if (rc == 0) {
memcpy(sbuffer->buffer_current, data, data_length);
sbuffer->buffer_current += data_length;
if (data_length > 0) { /* libtpms added (ubsan) */
memcpy(sbuffer->buffer_current, data, data_length);
sbuffer->buffer_current += data_length;
}
}
return rc;
}