diff --git a/programs/openbook-v2/src/error.rs b/programs/openbook-v2/src/error.rs
index b177ffd7..372ce1a1 100644
--- a/programs/openbook-v2/src/error.rs
+++ b/programs/openbook-v2/src/error.rs
@@ -8,6 +8,8 @@ pub enum OpenBookError {
     #[msg("")]
     SomeError,
 
+    #[msg("Name lenght above limit")]
+    InvalidInputNameLength,
     #[msg("Market cannot be created as expired")]
     InvalidInputMarketExpired,
     #[msg("Taker fees should be positive and if maker fees are negative, greater or equal to their abs value")]
diff --git a/programs/openbook-v2/src/instructions/create_market.rs b/programs/openbook-v2/src/instructions/create_market.rs
index 857f71d3..f9d96eda 100644
--- a/programs/openbook-v2/src/instructions/create_market.rs
+++ b/programs/openbook-v2/src/instructions/create_market.rs
@@ -23,15 +23,27 @@ pub fn create_market(
 ) -> Result<()> {
     let now_ts: u64 = Clock::get()?.unix_timestamp.try_into().unwrap();
 
+    require!(
+        maker_fee.unsigned_abs() as i128 <= FEES_SCALE_FACTOR,
+        OpenBookError::InvalidInputMarketFees
+    );
+    require!(
+        taker_fee.unsigned_abs() as i128 <= FEES_SCALE_FACTOR,
+        OpenBookError::InvalidInputMarketFees
+    );
     require!(
         taker_fee >= 0 && (maker_fee >= 0 || maker_fee.abs() <= taker_fee),
         OpenBookError::InvalidInputMarketFees
     );
+
     require!(
         time_expiry == 0 || time_expiry > Clock::get()?.unix_timestamp,
         OpenBookError::InvalidInputMarketExpired
     );
 
+    require_gt!(quote_lot_size, 0, OpenBookError::InvalidInputLots);
+    require_gt!(base_lot_size, 0, OpenBookError::InvalidInputLots);
+
     let open_orders_admin: NonZeroPubkeyOption = ctx
         .accounts
         .open_orders_admin
diff --git a/programs/openbook-v2/src/state/oracle.rs b/programs/openbook-v2/src/state/oracle.rs
index ac765009..ad18e10e 100644
--- a/programs/openbook-v2/src/state/oracle.rs
+++ b/programs/openbook-v2/src/state/oracle.rs
@@ -73,7 +73,7 @@ pub struct OracleConfigParams {
 impl OracleConfigParams {
     pub fn to_oracle_config(&self) -> OracleConfig {
         OracleConfig {
-            conf_filter: I80F48::from_num(self.conf_filter),
+            conf_filter: I80F48::checked_from_num(self.conf_filter).unwrap_or(I80F48::MAX),
             max_staleness_slots: self.max_staleness_slots.map(|v| v as i64).unwrap_or(-1),
             reserved: [0; 72],
         }
diff --git a/programs/openbook-v2/src/util.rs b/programs/openbook-v2/src/util.rs
index 07e73d6e..748f8c55 100644
--- a/programs/openbook-v2/src/util.rs
+++ b/programs/openbook-v2/src/util.rs
@@ -3,7 +3,7 @@ use anchor_lang::prelude::*;
 
 pub fn fill_from_str<const N: usize>(name: &str) -> Result<[u8; N]> {
     let name_bytes = name.as_bytes();
-    require!(name_bytes.len() <= N, OpenBookError::SomeError);
+    require!(name_bytes.len() <= N, OpenBookError::InvalidInputNameLength);
     let mut name_ = [0u8; N];
     name_[..name_bytes.len()].copy_from_slice(name_bytes);
     Ok(name_)