Opened 15 years ago
Closed 15 years ago
#4835 closed defect (fixed)
DRACI: Segfault Crash When Leaving Inventory
| Reported by: | digitall | Owned by: | rspalek |
|---|---|---|---|
| Priority: | high | Component: | Engine: Draci |
| Version: | Keywords: | ||
| Cc: | Game: | Dragon History |
Description
A segfault can be reliably generated by loading the attached savegame (at The Comedian's Tent), entering the inventory by going to the top of the screen, hitting F5 for Save/Load (which is disabled since inventory is open), then choosing "Resume", then exiting the inventory by moving to bottom right of screen.
Running this with valgrind gives : ==6715== Invalid read of size 4 ==6715== at 0x82CB529: Draci::Game::handleInventoryLoop() (game.cpp:335) ==6715== by 0x82CC455: Draci::Game::loop(Draci::LoopSubstatus, bool) (game.cpp:539) ==6715== by 0x82CE61D: Draci::Game::start() (game.cpp:176) ==6715== by 0x82C75D2: Draci::DraciEngine::run() (draci.cpp:365) ==6715== by 0x80565C0: runGame(PluginSubclass<MetaEngine> const*, OSystem&, Common::String const&) (main.cpp:216) ==6715== by 0x8056F69: scummvm_main (main.cpp:389) ==6715== by 0x8053451: main (main.cpp:65) ==6715== Address 0x40 is not stack'd, malloc'd or (recently) free'd
ScummVM 1.1.0pre48399 (Mar 25 2010 02:42:50) Features compiled in: Vorbis FLAC MP3 ALSA RGB zLib FluidSynth built on Linux x86_32 2.6.31 by GCC 4.3.4
Ticket imported from: #2976774. Ticket imported from: bugs/4835.
Attachments (1)
Change History (8)
by , 15 years ago
comment:2 by , 15 years ago
| Owner: | set to |
|---|---|
| Priority: | normal → high |
comment:3 by , 15 years ago
I can't try the savegame to actually see what happens right now, but assuming the line numbers are correct, this is where Valgrind warns:
333 If (_animUnderCursor != NULL && _animUnderCursor != _inventoryAnim && _animUnderCursor->getID() != kOverlayImage) { 334 _itemUnderCursor = getItem(kInventoryItemsID - _animUnderCursor->getID()); 335 assert(_itemUnderCursor->_anim == _animUnderCursor); 336 } else { 337 _itemUnderCursor = NULL; 338 }
So ironically, it crashes when it should assert. I guess.
comment:4 by , 15 years ago
yes. I'll look at it and the other bugs this week, probably tomorrow night. I hope it is good enough; tonight I cannot do it
comment:5 by , 15 years ago
I have traced this to _itemUnderCursor being NULL at line 335, so the assertion is dereferencing a NULL pointer. This is due to getItem returning NULL as the parameter is negative. This is due in turn to _animUnderCursor->getID() returning 274, rather than a valid Negative ID.
Since getItem() can return NULL, I have added a check for this to the assertion in SVN trunk r48434, but I'm not sure this is addressing the root cause.
spalek: if you could review this and advise, thanks.
comment:6 by , 15 years ago
Fixed by commit 48460. Your fix has just mitigated the assert, but the assert was valid, indicating that something was wrong. I believe the problem would have exerted itself by another means. I have fixed it properly; the problem was that the animations outside the inventory should not have been running but they were.
Thank you very much for looking into the problem when I was busy!
comment:7 by , 15 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
Savegame for Replication