efi_loader: error handling in tcg2_hash_pe_image()

If the hard coded array hash_algo_list[] contains an entry for an
unsupported algorithm, we should not leak resources new_efi and regs.

We should still extend the log with the digests for the supported
algorithms and not write any message.

The same holds true of tcg2_create_digest(): just continue in case
hash_algo_list[] contains an unsupported entry.

Fixes: 163a0d7e2cbd ("efi_loader: add PE/COFF image measurement")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
index 49f8a5e..7b7926a 100644 (file)
--- a/lib/efi_loader/efi_tcg2.c
+++ b/lib/efi_loader/efi_tcg2.c
@@ -706,8 +706,7 @@ static efi_status_t tcg2_create_digest(const u8 *input, u32 length,
                        sha512_finish(&ctx_512, final);
                        break;
                default:
-                       EFI_PRINT("Unsupported algorithm %x\n", hash_alg);
-                       return EFI_INVALID_PARAMETER;
+                       continue;
                }
                digest_list->digests[digest_list->count].hash_alg = hash_alg;
                memcpy(&digest_list->digests[digest_list->count].digest, final,
@@ -930,8 +929,7 @@ static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size,
                        hash_calculate("sha512", regs->reg, regs->num, hash);
                        break;
                default:
-                       EFI_PRINT("Unsupported algorithm %x\n", hash_alg);
-                       return EFI_INVALID_PARAMETER;
+                       continue;
                }
                digest_list->digests[digest_list->count].hash_alg = hash_alg;
                memcpy(&digest_list->digests[digest_list->count].digest, hash,