From: Dan Streetman <ddstreet@ieee.org>
Date: Mon, 21 Aug 2023 21:37:40 +0000 (-0400)
Subject: tpm2: check pcr value hash != 0 before looking up hash algorithm name
X-Git-Tag: v255-rc1~630^2~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8e757259c3f491841a6c5aa853f2cfce41e95b2e;p=thirdparty%2Fsystemd.git

tpm2: check pcr value hash != 0 before looking up hash algorithm name
---

diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
index db51d46bd46..8ba363fdccd 100644
--- a/src/shared/tpm2-util.c
+++ b/src/shared/tpm2-util.c
@@ -1763,7 +1763,7 @@ char *tpm2_pcr_value_to_string(const Tpm2PCRValue *pcr_value) {
         if (asprintf(&index, "%u", pcr_value->index) < 0)
                 return NULL;
 
-        const char *hash = tpm2_hash_alg_to_string(pcr_value->hash);
+        const char *hash = pcr_value->hash > 0 ? tpm2_hash_alg_to_string(pcr_value->hash) : NULL;
 
         if (hash && pcr_value->value.size > 0) {
                 value = hexmem(pcr_value->value.buffer, pcr_value->value.size);