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Reset 'errno' after failure to open or access a file

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Not being able to open a file is not necessarily a problem. If
and when it occurs, an informational or error message with the
actual filename is emitted as needed.

Reset 'errno' to prevent the "errno: No such file or directory (2)"
generic message.

Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Mimi Zohar
2022-05-12 18:18:14 -04:00
parent eb956b8d35
commit acb19d1894
2 changed files with 20 additions and 2 deletions
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4
src/libimaevm.c
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@ -144,6 +144,7 @@ static int add_file_hash(const char *file, EVP_MD_CTX *ctx)
fp = fopen(file, "r");
if (!fp) {
log_err("Failed to open: %s\n", file);
errno = 0;
return -1;
}
@ -258,6 +259,7 @@ EVP_PKEY *read_pub_pkey(const char *keyfile, int x509)
if (!fp) {
if (imaevm_params.verbose > LOG_INFO)
log_info("Failed to open keyfile: %s\n", keyfile);
errno = 0;
return NULL;
}
@ -735,6 +737,7 @@ static int read_keyid_from_cert(uint32_t *keyid_be, const char *certfile, int tr
if (!(fp = fopen(certfile, "r"))) {
log_err("Cannot open %s: %s\n", certfile, strerror(errno));
errno = 0;
return -1;
}
if (!PEM_read_X509(fp, &x, NULL, NULL)) {
@ -826,6 +829,7 @@ static EVP_PKEY *read_priv_pkey(const char *keyfile, const char *keypass)
fp = fopen(keyfile, "r");
if (!fp) {
log_err("Failed to open keyfile: %s\n", keyfile);
errno = 0;
return NULL;
}
pkey = PEM_read_PrivateKey(fp, NULL, NULL, (void *)keypass);