msgfmt: Don't overflow the stack with large values for --alignment.

Reported by <maxtodeath@gmail.com> at <https://savannah.gnu.org/bugs/?67743>.

* gettext-tools/src/write-mo.c (write_table): Use xmalloca instead of
alloca to allocate the buffer to fill with NUL bytes.

diff --git a/gettext-tools/src/write-mo.c b/gettext-tools/src/write-mo.c
index 07f08d30e0dd16f754dd64862ad2824c0d85f4f5..e3b81fef41fa33952f5914829ff3c351c1079a40 100644 (file)
--- a/gettext-tools/src/write-mo.c
+++ b/gettext-tools/src/write-mo.c
@@ -1010,7 +1010,7 @@ write_table (FILE *output_file, message_list_ty *mlp)
   offset = end_offset;
 
   /* A few zero bytes for padding.  */
-  char *null = (char *) alloca (alignment);
+  char *null = (char *) xmalloca (alignment);
   memset (null, '\0', alignment);
 
   /* Now write the original strings.  */