add missing pointer checks

src/encauth/ccm/ccm_add_aad.c

@@ -25,6 +25,9 @@ int ccm_add_aad(ccm_state *ccm,
    unsigned long y;
    int            err;
 
+   LTC_ARGCHK(ccm   != NULL);
+   LTC_ARGCHK(adata != NULL);
+
    if (ccm->aadlen < ccm->current_aadlen + adatalen) {
       return CRYPT_INVALID_ARG;
    }

src/encauth/ccm/ccm_add_nonce.c

@@ -25,6 +25,9 @@ int ccm_add_nonce(ccm_state *ccm,
    unsigned long x, y, len;
    int           err;
 
+   LTC_ARGCHK(ccm   != NULL);
+   LTC_ARGCHK(nonce != NULL);
+
    /* increase L to match the nonce len */
    ccm->noncelen = (noncelen > 13) ? 13 : noncelen;
    if ((15 - ccm->noncelen) > ccm->L) {

src/encauth/ccm/ccm_done.c

@@ -25,6 +25,8 @@ int ccm_done(ccm_state *ccm,
    unsigned long x, y;
    int            err;
 
+   LTC_ARGCHK(ccm != NULL);
+
    /* Check all data have been processed */
    if (ccm->ptlen != ccm->current_ptlen) {
       return CRYPT_ERROR;

src/encauth/ccm/ccm_init.c

@@ -29,6 +29,7 @@ int ccm_init(ccm_state *ccm, int cipher,
 {
    int            err;
 
+   LTC_ARGCHK(ccm    != NULL);
    LTC_ARGCHK(key    != NULL);
    LTC_ARGCHK(taglen != 0);
 

src/encauth/ccm/ccm_process.c

@@ -29,6 +29,8 @@ int ccm_process(ccm_state *ccm,
    unsigned char  y, z, b;
    int err;
 
+   LTC_ARGCHK(ccm != NULL);
+
    /* Check aad has been correctly added */
    if (ccm->aadlen != ccm->current_aadlen) {
       return CRYPT_ERROR;