fix: create empty token accounts with invalid mints (#1093)

Author: ananas-block

programs/compressed-token/src/delegation.rs

@@ -74,6 +74,9 @@ pub fn create_input_and_output_accounts_approve(
     Vec<PackedCompressedAccountWithMerkleContext>,
     Vec<OutputCompressedAccountWithPackedContext>,
 )> {
+    if inputs.input_token_data_with_context.is_empty() {
+        return err!(ErrorCode::NoInputTokenAccountsProvided);
+    }
     let (mut compressed_input_accounts, input_token_data, sum_lamports) =
         get_input_compressed_accounts_with_merkle_context_and_check_signer::<NOT_FROZEN>(
             authority,
@@ -201,6 +204,9 @@ pub fn create_input_and_output_accounts_revoke(
     Vec<PackedCompressedAccountWithMerkleContext>,
     Vec<OutputCompressedAccountWithPackedContext>,
 )> {
+    if inputs.input_token_data_with_context.is_empty() {
+        return err!(ErrorCode::NoInputTokenAccountsProvided);
+    }
     let (mut compressed_input_accounts, input_token_data, sum_lamports) =
         get_input_compressed_accounts_with_merkle_context_and_check_signer::<NOT_FROZEN>(
             authority,

programs/compressed-token/src/freeze.rs

@@ -76,6 +76,9 @@ pub fn create_input_and_output_accounts_freeze_or_thaw<
     Vec<PackedCompressedAccountWithMerkleContext>,
     Vec<OutputCompressedAccountWithPackedContext>,
 )> {
+    if inputs.input_token_data_with_context.is_empty() {
+        return err!(crate::ErrorCode::NoInputTokenAccountsProvided);
+    }
     let (mut compressed_input_accounts, input_token_data, _) =
         get_input_compressed_accounts_with_merkle_context_and_check_signer::<FROZEN_INPUTS>(
             &inputs.owner,

programs/compressed-token/src/lib.rs

@@ -184,4 +184,6 @@ pub enum ErrorCode {
     #[msg("Compress or decompress recipient is the same account as the token pool pda.")]
     IsTokenPoolPda,
     InvalidTokenPoolPda,
+    NoInputTokenAccountsProvided,
+    NoInputsProvided,
 }

programs/compressed-token/src/process_mint.rs

@@ -68,6 +68,9 @@ pub fn process_mint_to<'info>(
             amounts.len()
         );
         return err!(crate::ErrorCode::PublicKeyAmountMissmatch);
+    } else if recipient_pubkeys.is_empty() {
+        msg!("recipient_pubkeys is empty");
+        return err!(crate::ErrorCode::NoInputsProvided);
     }
 
     #[cfg(target_os = "solana")]

programs/compressed-token/src/process_transfer.rs

@@ -42,6 +42,11 @@ pub fn process_transfer<'a, 'b, 'c, 'info: 'b + 'c>(
         CompressedTokenInstructionDataTransfer::deserialize(&mut inputs.as_slice())?;
     bench_sbf_end!("t_deserialize");
     bench_sbf_start!("t_context_and_check_sig");
+    if inputs.input_token_data_with_context.is_empty()
+        && inputs.compress_or_decompress_amount.is_none()
+    {
+        return err!(crate::ErrorCode::NoInputTokenAccountsProvided);
+    }
     let (mut compressed_input_accounts, input_token_data, input_lamports) =
         get_input_compressed_accounts_with_merkle_context_and_check_signer::<NOT_FROZEN>(
             &ctx.accounts.authority.key(),