Ignore 'Broken Pipe' if child process does not read all of stdin (#1244)

* Ignore 'Broken Pipe' if child process does not read all of stdin

* follow clippy suggestion

Author: arpankapoor

libafl/src/executors/command.rs

@@ -135,8 +135,15 @@ impl CommandConfigurator for StdCommandConfigurator {
                 self.command.stdin(Stdio::piped()).spawn()?;
                 let mut handle = self.command.spawn()?;
                 let mut stdin = handle.stdin.take().unwrap();
-                stdin.write_all(input.target_bytes().as_slice())?;
-                stdin.flush()?;
+                if let Err(err) = stdin.write_all(input.target_bytes().as_slice()) {
+                    if err.kind() != std::io::ErrorKind::BrokenPipe {
+                        return Err(err.into());
+                    }
+                } else if let Err(err) = stdin.flush() {
+                    if err.kind() != std::io::ErrorKind::BrokenPipe {
+                        return Err(err.into());
+                    }
+                }
                 drop(stdin);
                 Ok(handle)
             }