File _service:obs_scm:backport-0020-CVE-2024-34155-t... of Package golang

File _service:obs_scm:backport-0020-CVE-2024-34155-track-depth-in-nested-element-lists.patch of Package golang

commit b232596139dbe96a62edbe3a2a203e856bf556eb
Author: Roland Shoemaker <bracewell@google.com>
Date:   Mon Jun 10 15:34:12 2024 -0700

[release-branch.go1.22] go/parser: track depth in nested element lists
    
    Prevents stack exhaustion with extremely deeply nested literal values,
    i.e. field values in structs.
    
    Updates #69138
    Fixes #69142
    Fixes CVE-2024-34155
    
    Change-Id: I2e8e33b44105cc169d7ed1ae83fb56df0c10f1ee
    Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/1520
    Reviewed-by: Robert Griesemer <gri@google.com>
    Reviewed-by: Damien Neil <dneil@google.com>
    Reviewed-by: Russ Cox <rsc@google.com>
    (cherry picked from commit eb1b038c0d01761694e7a735ef87ac9164c6568e)
    Reviewed-on: https://go-internal-review.googlesource.com/c/go/+/1561
    Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
    Reviewed-on: https://go-review.googlesource.com/c/go/+/611181
    Reviewed-by: Michael Pratt <mpratt@google.com>
    TryBot-Bypass: Dmitri Shuralyov <dmitshur@google.com>
    Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
    Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

diff --git a/src/go/parser/parser.go b/src/go/parser/parser.go
index 17808b366f..f268dea1a6 100644
--- a/src/go/parser/parser.go
+++ b/src/go/parser/parser.go
@@ -1676,6 +1676,8 @@ func (p *parser) parseElementList() (list []ast.Expr) {
 }
 
 func (p *parser) parseLiteralValue(typ ast.Expr) ast.Expr {
+	defer decNestLev(incNestLev(p))
+
 	if p.trace {
 		defer un(trace(p, "LiteralValue"))
 	}
diff --git a/src/go/parser/parser_test.go b/src/go/parser/parser_test.go
index 43b3416b27..c6dca66760 100644
--- a/src/go/parser/parser_test.go
+++ b/src/go/parser/parser_test.go
@@ -598,10 +598,11 @@ var parseDepthTests = []struct {
 	{name: "chan2", format: "package main; var x «<-chan »int"},
 	{name: "interface", format: "package main; var x «interface { M() «int» }»", scope: true, scopeMultiplier: 2}, // Scopes: InterfaceType, FuncType
 	{name: "map", format: "package main; var x «map[int]»int"},
-	{name: "slicelit", format: "package main; var x = «[]any{«»}»", parseMultiplier: 2},             // Parser nodes: UnaryExpr, CompositeLit
-	{name: "arraylit", format: "package main; var x = «[1]any{«nil»}»", parseMultiplier: 2},         // Parser nodes: UnaryExpr, CompositeLit
-	{name: "structlit", format: "package main; var x = «struct{x any}{«nil»}»", parseMultiplier: 2}, // Parser nodes: UnaryExpr, CompositeLit
-	{name: "maplit", format: "package main; var x = «map[int]any{1:«nil»}»", parseMultiplier: 2},    // Parser nodes: CompositeLit, KeyValueExpr
+	{name: "slicelit", format: "package main; var x = []any{«[]any{«»}»}", parseMultiplier: 3},      // Parser nodes: UnaryExpr, CompositeLit
+	{name: "arraylit", format: "package main; var x = «[1]any{«nil»}»", parseMultiplier: 3},         // Parser nodes: UnaryExpr, CompositeLit
+	{name: "structlit", format: "package main; var x = «struct{x any}{«nil»}»", parseMultiplier: 3}, // Parser nodes: UnaryExpr, CompositeLit
+	{name: "maplit", format: "package main; var x = «map[int]any{1:«nil»}»", parseMultiplier: 3},    // Parser nodes: CompositeLit, KeyValueExpr
+	{name: "element", format: "package main; var x = struct{x any}{x: «{«»}»}"},
 	{name: "dot", format: "package main; var x = «x.»x"},
 	{name: "index", format: "package main; var x = x«[1]»"},
 	{name: "slice", format: "package main; var x = x«[1:2]»"},