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Be explicit about why the zero-length check is there

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Since a valid mac operation context would guarantee that the stored
mac size is >= 4, it wasn't immediately obvious that the zero-length
check is meant for static analyzers and a bit of robustness.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-05-11 11:09:13 +02:00
parent be21dab099
commit f8ad2123f9
1 changed files with 6 additions and 2 deletions
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8
library/psa_crypto.c
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@ -2439,8 +2439,12 @@ psa_status_t psa_mac_sign_finish( psa_mac_operation_t *operation,
if( ! operation->is_sign )
return( PSA_ERROR_BAD_STATE );
/* Sanity checks on output buffer length. */
if( mac_size == 0 || mac_size < operation->mac_size )
/* Sanity check. This will guarantee that mac_size != 0 (and so mac != NULL)
* once all the error checks are done. */
if( operation->mac_size == 0 )
return( PSA_ERROR_BAD_STATE );
if( mac_size < operation->mac_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = psa_driver_wrapper_mac_sign_finish( operation,