Bug#1026045: Pointer truncation issue in DLOPEN_LOCAL_SCAN patch

Florian Weimer fweimer at redhat.com
Tue Dec 13 18:08:36 GMT 2022

Package: exim4
Version: 4.96-9

We are trying to port Fedora to a more modern variant of C.


This tripped up our Exim builds, and I see the same warning in the Exim
builds for Debian.  This patch should fix it:

diff --git a/src/local_scan.c b/src/local_scan.c
index 6ea5d2db841dbf19..42fbe79d02d9e9f5 100644
--- a/src/local_scan.c
+++ b/src/local_scan.c
@@ -14,6 +14,7 @@ extern uschar *local_scan_path;        /* Path to local_scan() library */
 #include <dlfcn.h>
+#include <stdlib.h>
 static int (*local_scan_fn)(int fd, uschar **return_text) = NULL;
 static int load_local_scan_library(void);

As I said on the Fedora bug

  exim: pointer truncation bug in downstream-only
  exim-4.96-dlopen-localscan.patch patch

I think it's harmless because it only happens in case of a configuration
problem, but I'd thought to file this bug nevertheless.


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