Merge pull request #20762 from apple/sr-9348

lorentey · web-flow · commit c1a7b71f46fd · 2018-11-26T21:04:17.000Z
[stdlib] _HashTable.copyContents: Fix out of bounds access
diff --git a/stdlib/public/core/HashTable.swift b/stdlib/public/core/HashTable.swift
@@ -406,7 +406,7 @@ extension _HashTable {
   @_effects(releasenone)
   internal func copyContents(of other: _HashTable) {
     _internalInvariant(bucketCount == other.bucketCount)
-    self.words.assign(from: other.words, count: bucketCount)
+    self.words.assign(from: other.words, count: wordCount)
   }
 
   /// Insert a new entry with the specified hash value into the table.

Original file line number	Diff line number	Diff line change
`@@ -406,7 +406,7 @@ extension _HashTable {`
`406`	`406`	`@_effects(releasenone)`
`407`	`407`	`internal func copyContents(of other: _HashTable) {`
`408`	`408`	`_internalInvariant(bucketCount == other.bucketCount)`
`409`		`- self.words.assign(from: other.words, count: bucketCount)`
	`409`	`+ self.words.assign(from: other.words, count: wordCount)`
`410`	`410`	`}`
`411`	`411`
`412`	`412`	`/// Insert a new entry with the specified hash value into the table.`