gcc: Backport a fix for gcc bug 105039

Backport a fix from:
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=9234cdca6ee88badfc00297e72f13dac4e540c79

which fixes rust recursion issues in the demangler.

(From OE-Core rev: bd2c8ed2d3ddec21cfcc44b26feee0285e0cd441)

Signed-off-by: pgowda <pgowda.cve@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 93 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-12.1.inc b/meta/recipes-devtools/gcc/gcc-12.1.inc
index 250b587e78..8c6c4a0305 100644
--- a/meta/recipes-devtools/gcc/gcc-12.1.inc
+++ b/meta/recipes-devtools/gcc/gcc-12.1.inc
@@ -63,6 +63,7 @@ SRC_URI = "${BASEURI} \
            file://0023-libatomic-Do-not-enforce-march-on-aarch64.patch \
            file://0024-Fix-install-path-of-linux64.h.patch \
            file://0025-Move-sched.h-include-ahead-of-user-headers.patch \
+           file://0026-rust-recursion-limit.patch \
 "
 SRC_URI[sha256sum] = "62fd634889f31c02b64af2c468f064b47ad1ca78411c45abe6ac4b5f8dd19c7b"
 
diff --git a/meta/recipes-devtools/gcc/gcc/0026-rust-recursion-limit.patch b/meta/recipes-devtools/gcc/gcc/0026-rust-recursion-limit.patch
new file mode 100644
index 0000000000..bbe2f18f6f
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0026-rust-recursion-limit.patch
@@ -0,0 +1,92 @@
+From 9234cdca6ee88badfc00297e72f13dac4e540c79 Mon Sep 17 00:00:00 2001
+From: Nick Clifton <nickc@redhat.com>
+Date: Fri, 1 Jul 2022 15:58:52 +0100
+Subject: [PATCH] Add a recursion limit to the demangle_const function in the
+ Rust demangler.
+
+libiberty/
+        PR demangler/105039
+        * rust-demangle.c (demangle_const): Add recursion limit.
+
+Upstream-Status: Backport [https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=9234cdca6ee88badfc00297e72f13dac4e540c79]
+---
+ libiberty/rust-demangle.c | 29 ++++++++++++++++++++---------
+ 1 file changed, 20 insertions(+), 9 deletions(-)
+
+diff --git a/libiberty/rust-demangle.c b/libiberty/rust-demangle.c
+index bb58d900e27..36afcfae278 100644
+--- a/libiberty/rust-demangle.c
++++ b/libiberty/rust-demangle.c
+@@ -126,7 +126,7 @@ parse_integer_62 (struct rust_demangler *rdm)
+     return 0;
+ 
+   x = 0;
+-  while (!eat (rdm, '_'))
++  while (!eat (rdm, '_') && !rdm->errored)
+     {
+       c = next (rdm);
+       x *= 62;
+@@ -1148,6 +1148,15 @@ demangle_const (struct rust_demangler *rdm)
+   if (rdm->errored)
+     return;
+ 
++  if (rdm->recursion != RUST_NO_RECURSION_LIMIT)
++    {
++      ++ rdm->recursion;
++      if (rdm->recursion > RUST_MAX_RECURSION_COUNT)
++       /* FIXME: There ought to be a way to report
++          that the recursion limit has been reached.  */
++       goto fail_return;
++    }
++
+   if (eat (rdm, 'B'))
+     {
+       backref = parse_integer_62 (rdm);
+@@ -1158,7 +1167,7 @@ demangle_const (struct rust_demangler *rdm)
+           demangle_const (rdm);
+           rdm->next = old_next;
+         }
+-      return;
++      goto pass_return;
+     }
+ 
+   ty_tag = next (rdm);
+@@ -1167,7 +1176,7 @@ demangle_const (struct rust_demangler *rdm)
+     /* Placeholder. */
+     case 'p':
+       PRINT ("_");
+-      return;
++      goto pass_return;
+ 
+     /* Unsigned integer types. */
+     case 'h':
+@@ -1200,18 +1209,20 @@ demangle_const (struct rust_demangler *rdm)
+       break;
+ 
+     default:
+-      rdm->errored = 1;
+-      return;
++      goto fail_return;
+     }
+ 
+-  if (rdm->errored)
+-    return;
+-
+-  if (rdm->verbose)
++  if (!rdm->errored && rdm->verbose)
+     {
+       PRINT (": ");
+       PRINT (basic_type (ty_tag));
+     }
++
++ fail_return:
++  rdm->errored = 1;
++ pass_return:
++  if (rdm->recursion != RUST_NO_RECURSION_LIMIT)
++    -- rdm->recursion;
+ }
+ 
+ static void
+-- 
+2.31.1
+