pgsql: don't return error for parsing errors

This allows the app-proto to continue onto parsing next PDUs, if
possible.

Task #5524

rust/src/pgsql/pgsql.rs

@@ -1,4 +1,4 @@
-/* Copyright (C) 2022-2024 Open Information Security Foundation
+/* Copyright (C) 2022-2025 Open Information Security Foundation
  *
  * You can copy, redistribute or modify this Program under the terms of
  * the GNU General Public License version 2 as published by the Free
@@ -25,6 +25,7 @@ use crate::conf::*;
 use crate::core::{AppProto, ALPROTO_FAILED, ALPROTO_UNKNOWN, IPPROTO_TCP, *};
 use crate::direction::Direction;
 use crate::flow::Flow;
+use nom7::error::{Error, ErrorKind};
 use nom7::{Err, IResult};
 use std;
 use std::collections::VecDeque;
@@ -397,8 +398,17 @@ impl PgsqlState {
                     );
                     return AppLayerResult::incomplete(consumed as u32, needed_estimation as u32);
                 }
+                Err(Err::Error(Error{code:ErrorKind::Verify, ..})) => {
+                    SCLogDebug!("PgsqlEvent::InvalidLength");
+                    AppLayerResult::ok();
+                }
+                Err(Err::Error(Error{code:ErrorKind::Switch, ..})) => {
+                    SCLogDebug!("PgsqlEvent::MalformedData");
+                    return AppLayerResult::ok();
+                }
                 Err(_) => {
-                    return AppLayerResult::err();
+                    SCLogDebug!("Error while parsing PGSQL request");
+                    return AppLayerResult::ok();
                 }
             }
         }
@@ -571,9 +581,17 @@ impl PgsqlState {
                     );
                     return AppLayerResult::incomplete(consumed as u32, needed_estimation as u32);
                 }
+                Err(Err::Error(Error{code:ErrorKind::Verify, ..})) => {
+                    SCLogDebug!("PgsqlEvent::InvalidLength");
+                    return AppLayerResult::ok();
+                }
+                Err(Err::Error(Error{code:ErrorKind::Switch, ..})) => {
+                    SCLogDebug!("PgsqlEvent::MalformedData");
+                    return AppLayerResult::ok();
+                }
                 Err(_) => {
-                    SCLogDebug!("Error while parsing PostgreSQL response");
-                    return AppLayerResult::err();
+                    SCLogDebug!("Error while parsing PGSQL response");
+                    return AppLayerResult::ok();
                 }
             }
         }