From bb2170fcc8f64d41bdf03f914e583e2ec3ca46a7 Mon Sep 17 00:00:00 2001
From: Barr <barr@barrisrael.com>
Date: Wed, 18 Jun 2025 14:17:15 +0300
Subject: [PATCH] Fix failed reads returning a buffer they never got

When a read fails, it is not allocated a buffer and the BID is set to 0, before this fix, this causes the program to return buffer 0 to the available buffers and can cause multiple future SQEs to get the same buffer 0.
---
 io_uring_echo_server.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/io_uring_echo_server.c b/io_uring_echo_server.c
index 775fc2b..9759511 100644
--- a/io_uring_echo_server.c
+++ b/io_uring_echo_server.c
@@ -149,8 +149,6 @@ int main(int argc, char *argv[]) {
                 int bytes_read = cqe->res;
                 int bid = cqe->flags >> 16;
                 if (cqe->res <= 0) {
-                    // read failed, re-add the buffer
-                    add_provide_buf(&ring, bid, group_id);
                     // connection closed or error
                     close(conn_i.fd);
                 } else {