qemu-kvm/kvm-net-socket-move-fd-type-checking-to-its-own-function.patch

From d6b3f9e4b388b8d621761104ddf075d6087f6d6c Mon Sep 17 00:00:00 2001
From: Laurent Vivier <lvivier@redhat.com>
Date: Fri, 9 Jun 2023 09:27:47 +0200
Subject: [PATCH 09/12] net: socket: move fd type checking to its own function

RH-Author: Laurent Vivier <lvivier@redhat.com>
RH-MergeRequest: 187: net: socket: do not close file descriptor if it's not a socket
RH-Jira: RHEL-582
RH-Acked-by: Stefano Brivio <None>
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Acked-by: David Gibson (Red Hat) <dgibson@redhat.com>
RH-Commit: [2/3] 9726f0ae81ac209b5db33dc7767f652867d8ca0a (lvivier/qemu-kvm-centos)

JIRA: https://issues.redhat.com/browse/RHEL-582

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit 23455ae341656ca867ee4a171826b9d280d6acb5)
---
 net/socket.c | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 24dcaa55bc..6b1f0fec3a 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -446,16 +446,32 @@ static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
     return s;
 }
 
+static int net_socket_fd_check(int fd, Error **errp)
+{
+    int so_type, optlen = sizeof(so_type);
+
+    if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
+        (socklen_t *)&optlen) < 0) {
+        error_setg(errp, "can't get socket option SO_TYPE");
+        return -1;
+    }
+    if (so_type != SOCK_DGRAM && so_type != SOCK_STREAM) {
+        error_setg(errp, "socket type=%d for fd=%d must be either"
+                   " SOCK_DGRAM or SOCK_STREAM", so_type, fd);
+        return -1;
+    }
+    return so_type;
+}
+
 static NetSocketState *net_socket_fd_init(NetClientState *peer,
                                           const char *model, const char *name,
                                           int fd, int is_connected,
                                           const char *mc, Error **errp)
 {
-    int so_type = -1, optlen=sizeof(so_type);
+    int so_type;
 
-    if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
-        (socklen_t *)&optlen)< 0) {
-        error_setg(errp, "can't get socket option SO_TYPE");
+    so_type = net_socket_fd_check(fd, errp);
+    if (so_type < 0) {
         close(fd);
         return NULL;
     }
@@ -465,10 +481,6 @@ static NetSocketState *net_socket_fd_init(NetClientState *peer,
                                         mc, errp);
     case SOCK_STREAM:
         return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
-    default:
-        error_setg(errp, "socket type=%d for fd=%d must be either"
-                   " SOCK_DGRAM or SOCK_STREAM", so_type, fd);
-        close(fd);
     }
     return NULL;
 }
-- 
2.39.3