added HMAC API error handling

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>

diff --git a/src/evmctl.c b/src/evmctl.c
index dea4a87..d257864 100644 (file)
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -996,7 +996,11 @@ static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *h
 
        log_info("generation: %u\n", generation);
 
-       HMAC_Init(&ctx, evmkey, sizeof(evmkey), EVP_sha1());
+       err = HMAC_Init(&ctx, evmkey, sizeof(evmkey), EVP_sha1());
+       if (!err) {
+               log_errno("HMAC_Init() failed");
+               return -1;
+       }
 
        for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) {
                err = getxattr(file, *xattrname, xattr_value, sizeof(xattr_value));
@@ -1007,7 +1011,11 @@ static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *h
                /*log_debug("name: %s, value: %s, size: %d\n", *xattrname, xattr_value, err);*/
                log_info("name: %s, size: %d\n", *xattrname, err);
                log_debug_dump(xattr_value, err);
-               HMAC_Update(&ctx, xattr_value, err);
+               err = HMAC_Update(&ctx, xattr_value, err);
+               if (!err) {
+                       log_errno("HMAC_Update() failed");
+                       return -1;
+               }
        }
 
        memset(&hmac_misc, 0, sizeof(hmac_misc));
@@ -1017,8 +1025,16 @@ static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *h
        hmac_misc.gid = st.st_gid;
        hmac_misc.mode = st.st_mode;
 
-       HMAC_Update(&ctx, (const unsigned char *)&hmac_misc, sizeof(hmac_misc));
-       HMAC_Final(&ctx, hash, &mdlen);
+       err = HMAC_Update(&ctx, (const unsigned char *)&hmac_misc, sizeof(hmac_misc));
+       if (!err) {
+               log_errno("HMAC_Update() failed");
+               return -1;
+       }
+       err = HMAC_Final(&ctx, hash, &mdlen);
+       if (!err) {
+               log_errno("HMAC_Final() failed");
+               return -1;
+       }
        HMAC_CTX_cleanup(&ctx);
 
        free(key);