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--- binutils.orig/libiberty/rust-demangle.c 2021-05-07 17:13:43.762229783 +0100
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+++ binutils-2.36.1/libiberty/rust-demangle.c 2021-05-07 17:14:39.805820593 +0100
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@@ -74,6 +74,12 @@ struct rust_demangler
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/* Rust mangling version, with legacy mangling being -1. */
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int version;
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+ /* Recursion depth. */
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+ uint recursion;
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+ /* Maximum number of times demangle_path may be called recursively. */
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+#define RUST_MAX_RECURSION_COUNT 1024
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+#define RUST_NO_RECURSION_LIMIT ((uint) -1)
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+
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uint64_t bound_lifetime_depth;
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};
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@@ -671,6 +677,15 @@ demangle_path (struct rust_demangler *rd
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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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switch (tag = next (rdm))
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{
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case 'C':
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@@ -688,10 +703,7 @@ demangle_path (struct rust_demangler *rd
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case 'N':
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ns = next (rdm);
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if (!ISLOWER (ns) && !ISUPPER (ns))
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- {
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- rdm->errored = 1;
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- return;
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- }
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+ goto fail_return;
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demangle_path (rdm, in_value);
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@@ -776,9 +788,15 @@ demangle_path (struct rust_demangler *rd
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}
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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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+ goto pass_return;
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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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@@ -1317,6 +1335,7 @@ rust_demangle_callback (const char *mang
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rdm.skipping_printing = 0;
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rdm.verbose = (options & DMGL_VERBOSE) != 0;
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rdm.version = 0;
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+ rdm.recursion = (options & DMGL_NO_RECURSE_LIMIT) ? RUST_NO_RECURSION_LIMIT : 0;
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rdm.bound_lifetime_depth = 0;
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/* Rust symbols always start with _R (v0) or _ZN (legacy). */
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