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Bug 3048

Summary: Crashes in Cocoa_SetWindowTitle
Product: SDL Reporter: David Ludwig <dll>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: dll
Version: HG 2.0   
Hardware: x86   
OS: Mac OS X 10.8   
Attachments: a sample program to reproduce SDL Bug 3048
call-stack of crash
Here's a screenshot of Xcode showing where the crash occurs
similar crash-inducing code
fix for forementioned crashes

Description David Ludwig 2015-07-04 20:52:42 UTC 
When using SDL_CreateWindowAndRenderer on OS-X, in conjunction with either SDL_WINDOW_FULLSCREEN or SDL_WINDOW_FULLSCREEN_DESKTOP, SDL will crash.  This occurs in the latest hg.libsdl.org/SDL code as of this writing (Changeset 9795 / 63c4d6f1f85f).

Here is the call-stack of the crash:

2015-07-04 16:48:28.337 pongbat[5560:567443] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSPlaceholderString initWithUTF8String:]: NULL cString'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff9b21a03c __exceptionPreprocess + 172
	1   libobjc.A.dylib                     0x00007fff8b9c876e objc_exception_throw + 43
	2   CoreFoundation                      0x00007fff9b219eed +[NSException raise:format:] + 205
	3   Foundation                          0x00007fff930bccfb -[NSString initWithUTF8String:] + 78
	4   SDL2                                0x00000001000823dd Cocoa_SetWindowTitle + 125
	5   SDL2                                0x0000000100083301 Cocoa_SetWindowFullscreen + 1537
	6   SDL2                                0x00000001000ea0d1 SDL_UpdateFullscreenMode + 1025
	7   SDL2                                0x00000001000ec10b SDL_SetWindowFullscreen_REAL + 315
	8   SDL2                                0x00000001000e9c80 SDL_FinishWindowCreation + 160
	9   SDL2                                0x00000001000e955f SDL_CreateWindow_REAL + 1087
	10  SDL2                                0x00000001000ef300 SDL_CreateWindowAndRenderer_REAL + 64
	11  SDL2                                0x0000000100130751 SDL_CreateWindowAndRenderer + 65
	12  pongbat                             0x0000000100000b38 main + 120
	13  pongbat                             0x0000000100000ab4 start + 52
)
libc++abi.dylib: terminating with uncaught exception of type NSException


A sample program is forthcoming.
Comment 1 David Ludwig 2015-07-04 20:55:22 UTC 
Created attachment 2212 [details]
a sample program to reproduce SDL Bug 3048
Comment 2 David Ludwig 2015-07-04 20:56:27 UTC 
Created attachment 2213 [details]
call-stack of crash
Comment 3 David Ludwig 2015-07-04 21:00:43 UTC 
Created attachment 2214 [details]
Here's a screenshot of Xcode showing where the crash occurs

The crash appears to occur because the window's title is unset, and Cocoa_SetWindowTitle makes an attempt to create an NSString from the NULL, 'window->title'.
Comment 4 David Ludwig 2015-07-05 01:01:13 UTC 
Created attachment 2215 [details]
similar crash-inducing code

I noticed that a similar set of code can cause crashes on OS X, this time using a windowed-mode SDL_Window.  Attached is a sample program, that will crash on OS X (in SDL HG, same changeset as before).
Comment 5 David Ludwig 2015-07-05 01:08:58 UTC 
Created attachment 2216 [details]
fix for forementioned crashes

Here is a Mercurial-generated patch to address the fore-mentioned crashes (in Cocoa_SetWindowTitle).

If this patch looks okay to you all, I'd be happy to push it out to hg.libsdl.org/SDL, if it'd help.
Comment 6 Sam Lantinga 2015-07-05 22:43:18 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/e0db4fedf80c
Comment 7 Sam Lantinga 2015-07-05 22:46:14 UTC 
Actually I added a more general fix here:
https://hg.libsdl.org/SDL/rev/c142db5785ad
Comment 8 David Ludwig 2015-07-06 00:12:00 UTC 
Cool.  :-)  I wasn't sure if a fix like that was kosher or not; a few other backends' SetWindowTitle implementations access window->title directly.  On a secondary inspection of them, I don't see any other sources for window->title crashes.  The OSX/Cocoa video backend appears to be the only one that accesses its SetWindowTitle implementation (Cocoa_SetWindowTitle) directly.  All others appear to only be called via SDL_SetWindowTitle and SDL_RecreateWindow, which do their own NULL checks.