diff --git a/llvm/include/llvm/Support/LEB128.h b/llvm/include/llvm/Support/LEB128.h
--- a/llvm/include/llvm/Support/LEB128.h
+++ b/llvm/include/llvm/Support/LEB128.h
@@ -134,7 +134,7 @@
   if (error)
     *error = nullptr;
   do {
-    if (end && p == end) {
+    if (p == end) {
       if (error)
         *error = "malformed uleb128, extends past end";
       if (n)
@@ -168,7 +168,7 @@
   if (error)
     *error = nullptr;
   do {
-    if (end && p == end) {
+    if (p == end) {
       if (error)
         *error = "malformed sleb128, extends past end";
       if (n)
diff --git a/llvm/unittests/Support/LEB128Test.cpp b/llvm/unittests/Support/LEB128Test.cpp
--- a/llvm/unittests/Support/LEB128Test.cpp
+++ b/llvm/unittests/Support/LEB128Test.cpp
@@ -113,6 +113,9 @@
     EXPECT_EQ(EXPECTED, Actual); \
   } while (0)
 
+  // Don't crash
+  EXPECT_EQ(0u, decodeULEB128(nullptr, nullptr, nullptr));
+
   // Decode ULEB128
   EXPECT_DECODE_ULEB128_EQ(0u, "\x00");
   EXPECT_DECODE_ULEB128_EQ(1u, "\x01");
@@ -148,6 +151,9 @@
     EXPECT_EQ(EXPECTED, Actual); \
   } while (0)
 
+  // Don't crash
+  EXPECT_EQ(0, decodeSLEB128(nullptr, nullptr, nullptr));
+
   // Decode SLEB128
   EXPECT_DECODE_SLEB128_EQ(0L, "\x00");
   EXPECT_DECODE_SLEB128_EQ(1L, "\x01");