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86 lines
2.0 KiB
86 lines
2.0 KiB
8 months ago
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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Nick Clifton <nickc@redhat.com>
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Date: Fri, 1 Jul 2022 15:58:52 +0100
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Subject: libiberty-infinite-recursion-fix-1-of-2.patch
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;; Backport Add a recursion limit to the demangle_const function in the Rust demangler.
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;; (Nick Clifton, RHEL-4234)
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libiberty/
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PR demangler/105039
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* rust-demangle.c (demangle_const): Add recursion limit.
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diff --git a/libiberty/rust-demangle.c b/libiberty/rust-demangle.c
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--- a/libiberty/rust-demangle.c
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+++ b/libiberty/rust-demangle.c
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@@ -126,7 +126,7 @@ parse_integer_62 (struct rust_demangler *rdm)
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return 0;
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x = 0;
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- while (!eat (rdm, '_'))
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+ while (!eat (rdm, '_') && !rdm->errored)
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{
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c = next (rdm);
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x *= 62;
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@@ -1148,6 +1148,15 @@ demangle_const (struct rust_demangler *rdm)
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if (rdm->errored)
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return;
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+ if (rdm->recursion != RUST_NO_RECURSION_LIMIT)
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+ {
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+ ++ rdm->recursion;
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+ if (rdm->recursion > RUST_MAX_RECURSION_COUNT)
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+ /* FIXME: There ought to be a way to report
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+ that the recursion limit has been reached. */
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+ goto fail_return;
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+ }
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+
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if (eat (rdm, 'B'))
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{
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backref = parse_integer_62 (rdm);
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@@ -1158,7 +1167,7 @@ demangle_const (struct rust_demangler *rdm)
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demangle_const (rdm);
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rdm->next = old_next;
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}
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- return;
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+ goto pass_return;
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}
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ty_tag = next (rdm);
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@@ -1167,7 +1176,7 @@ demangle_const (struct rust_demangler *rdm)
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/* Placeholder. */
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case 'p':
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PRINT ("_");
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- return;
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+ goto pass_return;
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/* Unsigned integer types. */
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case 'h':
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@@ -1200,18 +1209,20 @@ demangle_const (struct rust_demangler *rdm)
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break;
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default:
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- rdm->errored = 1;
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- return;
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+ goto fail_return;
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}
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- if (rdm->errored)
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- return;
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-
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- if (rdm->verbose)
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+ if (!rdm->errored && rdm->verbose)
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{
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PRINT (": ");
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PRINT (basic_type (ty_tag));
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}
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+
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+ fail_return:
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+ rdm->errored = 1;
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+ pass_return:
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+ if (rdm->recursion != RUST_NO_RECURSION_LIMIT)
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+ -- rdm->recursion;
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}
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static void
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