From: Richard Biener <rguenther@suse.de>
Date: Thu, 23 Oct 2025 08:54:48 +0000 (+0200)
Subject: Fix possible segfault in load/store-lane analysis
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ceda79ca5fe1a1a296624a98de8fd04958fbe55;p=thirdparty%2Fgcc.git

Fix possible segfault in load/store-lane analysis

The following fixes a segfault that appeared with a patch applying
additional permutes to a reduction SLP instance root.

	* tree-vect-loop.cc (vect_analyze_loop_2): Deal with NULL
	element in SLP_TREE_SCALAR_STMTS.
---

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 9320bf8e878..bc01e12f05b 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -2598,7 +2598,7 @@ again:
 
       stmt_vec_info vinfo;
       vinfo = SLP_TREE_SCALAR_STMTS (SLP_INSTANCE_TREE (instance))[0];
-      if (! STMT_VINFO_GROUPED_ACCESS (vinfo))
+      if (!vinfo || !STMT_VINFO_GROUPED_ACCESS (vinfo))
 	continue;
       vinfo = DR_GROUP_FIRST_ELEMENT (vinfo);
       unsigned int size = DR_GROUP_SIZE (vinfo);