[PATCH] tree-optimization/105232 - handle overly large sizes in component_ref_size

[Richard Biener via Gcc-patches]

The following properly checks tree_fits_poly_int64_p before converting
a size to a poly_int64.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

2022-04-12  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/105232
        * tree.cc (component_ref_size): Bail out for too large
        or non-constant sizes.
---
 gcc/tree.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/tree.cc b/gcc/tree.cc
index 8f83ea1aae3..609f0b4569a 100644
--- a/gcc/tree.cc
+++ b/gcc/tree.cc
@@ -12961,6 +12961,8 @@ component_ref_size (tree ref, special_array_member *sam 
/* = NULL */)
      to struct types with flexible array members.  */
   if (memsize)
     {
+      if (!tree_fits_poly_int64_p (memsize))
+       return NULL_TREE;
       poly_int64 memsz64 = memsize ? tree_to_poly_int64 (memsize) : 0;
       if (known_lt (baseoff, memsz64))
        {
-- 
2.34.1