Bug 392202

Summary:	4MB metadata limit is too small
Product:	[Applications] ktorrent	Reporter:	FeepingCreature <default_357-line>
Component:	general	Assignee:	Joris Guisson <joris.guisson>
Status:	RESOLVED FIXED
Severity:	normal	CC:	andrius, mail
Priority:	NOR
Version First Reported In:	5.1
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	21.04.0
Sentry Crash Report:

Description FeepingCreature 2018-03-22 22:26:37 UTC

When opening a torrent file that is larger than 4MB, KTorrent accepts it; however, it rejects every peer that attempts to connect due to "wrong metadata size" - a message that is highly misleading, since the displayed size also does not match the torrent file; however, it's due to exceeding MAX_METADATA_SIZE in libktorrent/src/peer/peer.cpp.

At least one torrent file with a 9MB torrent (the Touhou Lossless Music Collection) exists in the wild. When patched, peers connect without issue.

Comment 1 Melvin Vermeeren 2020-12-04 19:04:34 UTC

Hit the same issue recently and today I decided to dig into things, found the root cause and also the bug report here. MR submitted to fix it, see https://invent.kde.org/network/libktorrent/-/merge_requests/26.