Add fix for rhbz# 1645886. Thanks Oleg Samarin.

chntpw-140201-fix-bogus-errno-use.patch

@@ -0,0 +1,34 @@
+diff -u chntpw-140201.orig/ntreg.c chntpw-140201/ntreg.c
+--- chntpw-140201.orig/ntreg.c	2019-06-22 13:09:59.583717369 -0700
++++ chntpw-140201/ntreg.c	2019-06-22 13:16:26.714726148 -0700
+@@ -4241,10 +4241,13 @@
+   do {  /* On some platforms read may not block, and read in chunks. handle that */
+     r = read(hdesc->filedesc, hdesc->buffer + rt, hdesc->size - rt);
+     rt += r;
+-  } while ( !errno && (rt < hdesc->size) );
++  } while ( r > 0 && (rt < hdesc->size) );
+ 
+-  if (errno) { 
+-    perror("openHive(): read error: ");
++  if (r <= 0) { 
++    if (r < 0)
++      perror("openHive(): read error");
++    else
++      fprintf(stderr, "openHive(): read error: unexpected EOF\n");
+     closeHive(hdesc);
+     return(NULL);
+   }
+@@ -4255,10 +4258,10 @@
+     return(NULL);
+   }
+ 
+-  if (r < sizeof (*hdesc)) {
++  if (rt < sizeof (*hdesc)) {
+     fprintf(stderr,
+-	    "file is too small; got %d bytes while expecting %d or more\n",
+-	    r, sizeof (*hdesc));
++	    "file is too small; got %d bytes while expecting %zu or more\n",
++	    rt, sizeof (*hdesc));
+     closeHive(hdesc);
+     return(NULL);
+   }

chntpw.spec

@@ -1,7 +1,7 @@
 Name:           chntpw
 # Version is taken from HISTORY.txt
 Version:        1.00
-Release:        3.140201%{?dist}
+Release:        4.140201%{?dist}
 Summary:        Change passwords in Windows SAM files
 License:        GPLv2
 URL:            http://pogostick.net/~pnh/ntpasswd/
@@ -28,6 +28,9 @@ Patch5:         chntpw-080526-correct-test-for-failing-open-syscall.patch
 Patch6:         chntpw-110511-detect-failure-to-write-key.patch
 Patch7:         chntpw-110511-reged-no-deref-null.patch
 
+# Patch derived from Oleg Samarin (RHBZ#1645886)
+Patch8:		chntpw-140201-fix-bogus-errno-use.patch
+
 
 %description
 This is a utility to (re)set the password of any user that has a valid
@@ -53,6 +56,7 @@ mv WinReg.txt.eol WinReg.txt
 %patch5 -p1
 %patch6 -p1
 %patch7 -p1
+%patch8 -p1
 
 
 %build
@@ -82,6 +86,9 @@ cp -p %{SOURCE10} %{SOURCE11} %{SOURCE12} %{SOURCE13} \
 
 
 %changelog
+* Sat Jun 22 2019 Conrad Meyer <cemeyer@uw.edu> - 1.00-4.140201
+- Add fix for rhbz# 1645886.  Thanks Oleg Samarin.
+
 * Thu Jan 31 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.00-3.140201
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild