0001-Print-some-info-if-we-are-asked-to-look-up-a-method-.patch

From dbb849d0228276062fff1acf3a2d49b7ff065b5d Mon Sep 17 00:00:00 2001
From: Aleksey Kliger <alklig@microsoft.com>
Date: Wed, 3 Jan 2018 17:38:07 -0500
Subject: [PATCH] Print some info if we are asked to look up a method token
 that's outside the range of the PPDB.

---
 mono/metadata/debug-mono-ppdb.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mono/metadata/debug-mono-ppdb.c b/mono/metadata/debug-mono-ppdb.c
index 4d61efe345a..8198ef523b8 100644
--- a/mono/metadata/debug-mono-ppdb.c
+++ b/mono/metadata/debug-mono-ppdb.c
@@ -414,7 +414,15 @@ mono_ppdb_get_seq_points (MonoDebugMethodInfo *minfo, char **source_file, GPtrAr
 
 	method_idx = mono_metadata_token_index (method->token);
 
-	mono_metadata_decode_row (&tables [MONO_TABLE_METHODBODY], method_idx-1, cols, MONO_METHODBODY_SIZE);
+	MonoTableInfo *methodbody_table = &tables [MONO_TABLE_METHODBODY];
+	if (G_UNLIKELY (method_idx - 1 >= methodbody_table->rows)) {
+		char *method_name = mono_method_full_name (method, FALSE);
+		g_warning ("Method idx %d is greater than number of rows (%d) in PPDB MethodDebugInformation table, for method %s",
+			 method_idx - 1, methodbody_table->rows, method_name);
+		g_free (method_name);
+		return;
+	}
+	mono_metadata_decode_row (methodbody_table, method_idx-1, cols, MONO_METHODBODY_SIZE);
 
 	docidx = cols [MONO_METHODBODY_DOCUMENT];
 
-- 
2.15.1