fix data overflow with init_putv

The simplest code to reproduce this bug seems to be
    int a[][] = {{1,1,1,1,1,1,1}};

1 files changed, 4 insertions, 0 deletions

diff --git a/tcc.c b/tcc.c
index 0bfc5c0..772b171 100644
--- a/tcc.c
+++ b/tcc.c
@@ -8808,6 +8808,10 @@ static void init_putv(CType *type, Section *sec, unsigned long c,
         /* XXX: generate error if incorrect relocation */
         gen_assign_cast(&dtype);
         bt = type->t & VT_BTYPE;
+        /* we'll write at most 12 bytes */
+        if (c + 12 > sec->data_allocated) {
+            section_realloc(sec, c + 12);
+        }
         ptr = sec->data + c;
         /* XXX: make code faster ? */
         if (!(type->t & VT_BITFIELD)) {