File cd7acb33-virfile-report-error.patch of Package libvirt.26629

commit cd7acb33231837c4bcf6ccbd7d451e145b5f3667
Author: Michal Prívozník <mprivozn@redhat.com>
Date:   Mon Mar 28 13:29:19 2022 +0200

    virfile: Report error when changing pipe size fails
    
    When changing the size of pipe that virFileWrapperFdNew() creates
    we start at 1MiB and if that fails because it's above the system
    wide limit we get EPERM and continue with half of the size.
    
    However, we might get another error in which case we should
    report proper system error and return failure from
    virFileWrapperFdNew().
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
    Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

Index: libvirt-8.0.0/src/util/virfile.c
===================================================================
--- libvirt-8.0.0.orig/src/util/virfile.c
+++ libvirt-8.0.0/src/util/virfile.c
@@ -217,7 +217,7 @@ struct _virFileWrapperFd {
  *
  * OS note: only for linux, on other OS this is a no-op.
  */
-static void
+static int
 virFileWrapperSetPipeSize(int fd)
 {
     int sz;
@@ -230,21 +230,24 @@ virFileWrapperSetPipeSize(int fd)
             continue; /* retry with half the size */
         }
         if (rv < 0) {
-            break;
+            virReportSystemError(errno, "%s",
+                                 _("unable to set pipe size"));
+            return -1;
         }
         VIR_DEBUG("fd %d pipe size adjusted to %d", fd, sz);
-        return;
+        return 0;
     }
 
     VIR_WARN("unable to set pipe size, data transfer might be slow: %s",
              g_strerror(errno));
+    return 0;
 }
 
 # else /* !__linux__ */
-static void
+static int
 virFileWrapperSetPipeSize(int fd G_GNUC_UNUSED)
 {
-    return;
+    return 0;
 }
 # endif /* !__linux__ */
 
@@ -323,6 +326,9 @@ virFileWrapperFdNew(int *fd, const char
     if (virPipe(pipefd) < 0)
         goto error;
 
+    if (virFileWrapperSetPipeSize(pipefd[output]) < 0)
+        goto error;
+
     if (!(iohelper_path = virFileFindResource("libvirt_iohelper",
                                               abs_top_builddir "/src",
                                               LIBEXECDIR)))
@@ -330,8 +336,6 @@ virFileWrapperFdNew(int *fd, const char
 
     ret->cmd = virCommandNewArgList(iohelper_path, name, NULL);
 
-    virFileWrapperSetPipeSize(pipefd[output]);
-
     if (output) {
         virCommandSetInputFD(ret->cmd, pipefd[0]);
         virCommandSetOutputFD(ret->cmd, fd);