Avoid crash in PKCS1v1.5 unpadding if input len <= 2

Don't think this can't happen outside of a fuzzer test

1 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/pk_pad/eme_pkcs1/eme_pkcs.cpp b/src/lib/pk_pad/eme_pkcs1/eme_pkcs.cpp
index 9bab8eb95..b14808da0 100644
--- a/src/lib/pk_pad/eme_pkcs1/eme_pkcs.cpp
+++ b/src/lib/pk_pad/eme_pkcs1/eme_pkcs.cpp
@@ -48,6 +48,12 @@ secure_vector<byte> EME_PKCS1v15::pad(const byte in[], size_t inlen,
 secure_vector<byte> EME_PKCS1v15::unpad(byte& valid_mask,
                                         const byte in[], size_t inlen) const
    {
+   if(inlen < 2)
+      {
+      valid_mask = false;
+      return secure_vector<byte>();
+      }
+
    CT::poison(in, inlen);
 
    byte bad_input_m = 0;