global: make sure that bulk config string is null-terminated

* src/global.c (_gcry_get_config): Append null-terminator to output
in the 'what == NULL' case.
--

Config string was not being explicitly null-terminated which resulted
garbage output from tests/version with ASAN enabled builds.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/global.c b/src/global.c
index 57f7329b..8940cea0 100644
--- a/src/global.c
+++ b/src/global.c
@@ -434,6 +434,13 @@ _gcry_get_config (int mode, const char *what)
     return NULL;
 
   print_config (what, fp);
+
+  if (!what)
+    {
+      /* Null-terminate bulk output. */
+      gpgrt_fwrite ("\0", 1, 1, fp);
+    }
+
   if (gpgrt_ferror (fp))
     {
       save_errno = errno;