[gcc r13-4075] bpf: avoid possible use of uninitialized variable

[gcc r13-4075] bpf: avoid possible use of uninitialized variable

[David Faust]

https://gcc.gnu.org/g:6052482f841634522c6d2e56c4231f8df2dc6d3e

commit r13-4075-g6052482f841634522c6d2e56c4231f8df2dc6d3e
Author: David Faust <david.faust@oracle.com>
Date:   Tue Nov 15 09:21:51 2022 -0800

    bpf: avoid possible use of uninitialized variable
    
    Fix a maybe-uninitialized warning introduced in commit:
    068baae1864 bpf: add preserve_field_info builtin
    
    gcc/
    
            * config/bpf/bpf.cc (bpf_expand_builtin): Avoid use of uninitialized
            variable in error case.

Diff:
---
 gcc/config/bpf/bpf.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gcc/config/bpf/bpf.cc b/gcc/config/bpf/bpf.cc
index 16af2412bf6..51e46955015 100644
--- a/gcc/config/bpf/bpf.cc
+++ b/gcc/config/bpf/bpf.cc
@@ -1254,11 +1254,14 @@ bpf_expand_builtin (tree exp, rtx target ATTRIBUTE_UNUSED,
       /* A resolved overloaded __builtin_preserve_field_info.  */
       tree src = CALL_EXPR_ARG (exp, 0);
       tree kind_tree = CALL_EXPR_ARG (exp, 1);
-      unsigned HOST_WIDE_INT kind_val;
+      unsigned HOST_WIDE_INT kind_val = 0;
       if (tree_fits_uhwi_p (kind_tree))
 	kind_val = tree_to_uhwi (kind_tree);
       else
-	error ("invalid argument to built-in function");
+	{
+	  error ("invalid argument to built-in function");
+	  return expand_normal (error_mark_node);
+	}
 
       enum btf_core_reloc_kind kind = (enum btf_core_reloc_kind) kind_val;