diff options
authorDavid Oberhollenzer <>2019-11-10 14:17:33 +0100
committerDavid Oberhollenzer <>2019-11-10 14:22:53 +0100
commit46c16855b1bed2704549d834acd2e9812ff3bf1e (patch)
parent413b3c919c2c96d6e0224f86eb6d3d7ce3b79238 (diff)
mkfs.ubifs: fscrypt: bail from encrypt_block if gen_essiv_salt fails
What originally cought my attention was that gen_essiv_salt has a size_t return type and error paths that return -1 on failure. Further investigation revealed that the error value is never checked for. The encrypt_block function doesn't use the return value in any way and simply continues onward. Furthermore, the gen_essiv_salt function has an error case that emits an error message but returns success state. This patch modifes gen_essiv_salt to return an error status in all error branches, changes the return type to ssize_t and adds a check to encrypt_block if gen_essiv_salt fails. Signed-off-by: David Oberhollenzer <>
1 files changed, 6 insertions, 3 deletions
diff --git a/ubifs-utils/mkfs.ubifs/crypto.c b/ubifs-utils/mkfs.ubifs/crypto.c
index cd68e37..d31bd2a 100644
--- a/ubifs-utils/mkfs.ubifs/crypto.c
+++ b/ubifs-utils/mkfs.ubifs/crypto.c
@@ -109,7 +109,7 @@ fail:
return -1;
-static size_t gen_essiv_salt(const void *iv, size_t iv_len, const void *key, size_t key_len, void *salt)
+static ssize_t gen_essiv_salt(const void *iv, size_t iv_len, const void *key, size_t key_len, void *salt)
size_t ret;
const EVP_CIPHER *cipher;
@@ -127,8 +127,10 @@ static size_t gen_essiv_salt(const void *iv, size_t iv_len, const void *key, siz
ret = do_encrypt(cipher, iv, iv_len, sha256, EVP_MD_size(EVP_sha256()), NULL, 0, salt);
- if (ret != iv_len)
+ if (ret != iv_len) {
errmsg("Unable to compute ESSIV salt, return value %zi instead of %zi", ret, iv_len);
+ return -1;
+ }
@@ -154,7 +156,8 @@ static ssize_t encrypt_block(const void *plaintext, size_t size,
if (cipher == EVP_aes_128_cbc()) {
tweak = alloca(ivsize);
- gen_essiv_salt(&iv, FS_IV_SIZE, key, key_len, tweak);
+ if (gen_essiv_salt(&iv, FS_IV_SIZE, key, key_len, tweak) < 0)
+ return -1;
} else {
tweak = &iv;