readelf: handle_core_item make sure variable length array isn't zero size.

The printed array should have at least space for the terminating zero char.
Found by gcc -fsanitize=undefined while running run-readelf-vmcoreinfo.sh.
runtime error: variable length array bound evaluates to non-positive value 0

Signed-off-by: Mark Wielaard <mjw@redhat.com>

diff --git a/src/ChangeLog b/src/ChangeLog
index 874e255..28e52f9 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,10 @@
 2014-04-22  Mark Wielaard  <mjw@redhat.com>
 
+       * readelf.c (handle_core_item): Make sure variable length array
+       contains at least enough space for terminating zero char.
+
+2014-04-22  Mark Wielaard  <mjw@redhat.com>
+
        * readelf.c (print_gdb_index_section): Use unsigned int for 31 bits
        left shift.
 

diff --git a/src/readelf.c b/src/readelf.c
index da1bf73..697a361 100644 (file)
--- a/src/readelf.c
+++ b/src/readelf.c
@@ -8128,7 +8128,7 @@ handle_core_item (Elf *core, const Ebl_Core_Item *item, const void *desc,
       const unsigned int bias = item->format == 'b';
 
       {
-       char printed[(negate ? nbits - pop : pop) * 16];
+       char printed[(negate ? nbits - pop : pop) * 16 + 1];
        char *p = printed;
        *p = '\0';