[ima-evm-utils PATCH v2 02/13] Free public keys list

Mimi Zohar
2023-12-06T19:28:12Z

On failure to allocate memory, free the public keys list.

Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
---
src/imaevm.h | 1 +
src/libimaevm.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+)

diff --git a/src/imaevm.h b/src/imaevm.h
index 18d7b0e447e1..470e8376f2fb 100644
--- a/src/imaevm.h
+++ b/src/imaevm.h
@@ -249,6 +249,7 @@ uint32_t imaevm_read_keyid(const char *certfile);
int sign_hash(const char *algo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig);
int verify_hash(const char *file, const unsigned char *hash, int size, unsigned char *sig, int siglen);
int ima_verify_signature(const char *file, unsigned char *sig, int siglen, unsigned char *digest, int digestlen);
+void imaevm_free_public_keys(void *public_keys);
void init_public_keys(const char *keyfiles);
int imaevm_hash_algo_from_sig(unsigned char *sig);
const char *imaevm_hash_algo_by_id(int algo);
diff --git a/src/libimaevm.c b/src/libimaevm.c
index 244774d01805..534468fe99ca 100644
--- a/src/libimaevm.c
+++ b/src/libimaevm.c
@@ -399,11 +399,25 @@ static EVP_PKEY *find_keyid(uint32_t keyid)
return 0;
}

+void imaevm_free_public_keys(void *public_keys)
+{
+ struct public_key_entry *entry = public_keys, *next;
+
+ while (entry) {
+ next = entry->next;
+ if (entry->key)
+ free(entry->key);
+ free(entry);
+ entry = next;
+ }
+}
+
void init_public_keys(const char *keyfiles)
{
struct public_key_entry *entry;
char *tmp_keyfiles, *keyfiles_free;
char *keyfile;
+ int err = 0;
int i = 1;

tmp_keyfiles = strdup(keyfiles);
@@ -417,6 +431,7 @@ void init_public_keys(const char *keyfiles)
entry = malloc(sizeof(struct public_key_entry));
if (!entry) {
perror("malloc");
+ err = -ENOMEM;
break;
}

@@ -433,6 +448,8 @@ void init_public_keys(const char *keyfiles)
g_public_keys = entry;
}
free(keyfiles_free);
+ if (err < 0)
+ imaevm_free_public_keys(g_public_keys);
}

/*
--
2.39.3