[ scummvm-Bugs-3614568 ] SCI: KQ6 Mac: crash in createThumbnail_2 when saving

[SourceForge.net]

Bugs item #3614568, was opened at 2013-06-23 19:54
Message generated for change (Tracker Item Submitted) made by dmwarren
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=418820&aid=3614568&group_id=37116

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Unknown Crash/Other
Group: SCI: King's Quest VI
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: dmwarren (dmwarren)
Assigned to: Nobody/Anonymous (nobody)
Summary: SCI: KQ6 Mac: crash in createThumbnail_2 when saving

Initial Comment:
Game affected:
	King's Quest 6 (Macintosh, English)

Platforms affected:
	Confirmed on Mac OS X 10.8 and Debian 7.

Last known build with this bug
	ScummVM 1.7.0git564-gc7ec14d
	
Earliest known build with problem:
	ScummVM 1.6.0git1480-g9827c40

Earliest known build without problem:
	ScummVM 1.5.0 final

Reproducible:
	~60% of the time/somewhat easily.

What triggers the crash:
	Load the Mac version of KQ6, start the game, and initiate a save right away. If it doesn't crash on the first try, walk to another screen and try again.  ScummVM will crash somewhere in createThumbnail_2() after entering a savegame name and clicking "OK" to start the save:

	scummvm(23992,0x7fff7b18f180) malloc: *** error for object 0x7f942d4b9608: incorrect checksum for freed object - object was probably modified after being freed.
	*** set a breakpoint in malloc_error_break to debug
	Abort trap: 6

	Valgrind leakcheck output attached.

What should happen instead:
	ScummVM should not crash. ;)

Thanks for the ScummVM team's hard work. Let me know if you need more info or testing.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=418820&aid=3614568&group_id=37116