From 9344e6ad1a8389728c81a375f6812c435e5ac71c Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Mon, 1 Feb 2010 22:17:44 +0100
Subject: [PATCH] avoid a probable EINVAL from lseek

* src/qemu/qemu_driver.c (qemudLogReadFD): Don't pass a negative
offset (from a preceding failed attempt to seek to EOF) to this use
of lseek.
---
 src/qemu/qemu_driver.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 22593bf8ea..676a27bae2 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -558,8 +558,8 @@ qemudLogReadFD(virConnectPtr conn, const char* logDir, const char* name, off_t p
         close(fd);
         return -1;
     }
-    if (lseek(fd, pos, SEEK_SET) < 0) {
-        virReportSystemError(conn, errno,
+    if (pos < 0 || lseek(fd, pos, SEEK_SET) < 0) {
+      virReportSystemError(conn, pos < 0 ? 0 : errno,
                              _("Unable to seek to %lld in %s"),
                              (long long) pos, logfile);
         close(fd);