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Do not attempt to wipe output buffer if it is NULL

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If the output buffer is NULL, it either:

* Does not need wiping because it is zero-length.
* Has failed allocation of a copy.
* Has not yet been written to as a copy hasn't been allocated.

In any of these circumstances, we should not try to write the buffer,
so perform a NULL check before wiping it.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
This commit is contained in:
David Horstmann 2024-03-11 17:02:03 +00:00
parent 5ba3f5f7a5
commit c5064c83a1
1 changed files with 4 additions and 2 deletions
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6
library/psa_crypto.c
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@ -3658,8 +3658,10 @@ psa_status_t psa_sign_hash_complete(
exit:
psa_wipe_tag_output_buffer(signature, status, signature_size,
*signature_length);
if (signature != NULL) {
psa_wipe_tag_output_buffer(signature, status, signature_size,
*signature_length);
}
if (status != PSA_OPERATION_INCOMPLETE) {
if (status != PSA_SUCCESS) {