From: Matt Joiner <anacrolix@gmail.com>
Date: Fri, 29 Apr 2016 18:08:02 +0000 (+1000)
Subject: Fix crash when peers have sent undersized bitfields and we get the torrent info
X-Git-Tag: v1.0.0~769
X-Git-Url: http://www.git.stargrave.org/?a=commitdiff_plain;h=63c5ca1f0188f73b696fb00bf61a4ca1d343a2b7;p=btrtrc.git

Fix crash when peers have sent undersized bitfields and we get the torrent info
---

diff --git a/connection.go b/connection.go
index 432519f0..8d3c45ad 100644
--- a/connection.go
+++ b/connection.go
@@ -629,7 +629,7 @@ func (cn *connection) peerSentBitfield(bf []bool) error {
 	// We know that the last byte means that at most the last 7 bits are
 	// wasted.
 	cn.raisePeerMinPieces(len(bf) - 7)
-	if cn.t.haveInfo() {
+	if cn.t.haveInfo() && len(bf) > cn.t.numPieces() {
 		// Ignore known excess pieces.
 		bf = bf[:cn.t.numPieces()]
 	}