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libimaevm: Properly check for error returned by EVP_DigestUpdate

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The error checking in add_dir_hash was wrong. EVP_DigestUpdate returns 1
on success and 0 on error, so we cannot just accumulate it using or'ing.

>From the man page:
       EVP_DigestInit_ex(), EVP_DigestUpdate(), EVP_DigestFinal_ex()
           Returns 1 for success and 0 for failure.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Stefan Berger 2021-04-19 11:01:46 -04:00 committed by Mimi Zohar
parent 81478c5667
commit 161a4a5026
1 changed files with 4 additions and 6 deletions
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10
src/libimaevm.c
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@ -179,7 +179,6 @@ out:
static int add_dir_hash(const char *file, EVP_MD_CTX *ctx)
{
int err;
struct dirent *de;
DIR *dir;
unsigned long long ino, off;
@ -198,11 +197,10 @@ static int add_dir_hash(const char *file, EVP_MD_CTX *ctx)
type = de->d_type;
log_debug("entry: %s, ino: %llu, type: %u, off: %llu, reclen: %hu\n",
de->d_name, ino, type, off, de->d_reclen);
err = EVP_DigestUpdate(ctx, de->d_name, strlen(de->d_name));
/*err |= EVP_DigestUpdate(ctx, &off, sizeof(off));*/
err |= EVP_DigestUpdate(ctx, &ino, sizeof(ino));
err |= EVP_DigestUpdate(ctx, &type, sizeof(type));
if (!err) {
if (EVP_DigestUpdate(ctx, de->d_name, strlen(de->d_name)) != 1 ||
/* EVP_DigestUpdate(ctx, &off, sizeof(off)) != 1 || */
EVP_DigestUpdate(ctx, &ino, sizeof(ino)) != 1||
EVP_DigestUpdate(ctx, &type, sizeof(type)) != 1) {
log_err("EVP_DigestUpdate() failed\n");
output_openssl_errors();
result = 1;