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Bug 571

Summary: SDL crashes when xserevr disconnects.
Product: SDL Reporter: Mikulas Patocka <mikulas>
Component: *don't know*Assignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: sezeroz
Version: 1.2.10Keywords: target-1.2.14
Hardware: x86   
OS: Other   

Description Mikulas Patocka 2008-03-24 12:16:39 UTC 
I got a crash when xserver terminated the connection (it happens only with small probability, the connection has to be terminated at certain point).

Crash happened in xio_errhandler due to SDL_VideoSurface being NULL.

This is the stack trace:
TARGET_LIB:/LIBSDL.A/SDL_X11VIDEO.O:xio_errhandler+1E, _XIOError+16, LIBX11.A/XLIBINT.O:_XFlushInt+13A, OBJ/UTHREAD.O:SET_READY+39, _XReply+5F, __FN_PREEMPT_AST+A2, XSync+4E, TARGET_LIB:/LIBSDL.A/SDL_X11VIDEO.O:X11_SetVideoMode+2E, SDL_SetVideoMode+172, _Z10mem_writewjt+55, _Z11GFX_SetSizejjjddPFv23GFX_CallBackFunctions_tE+357, X11_Pending+6D, GUI/LIBGUI.A/RENDER.O:_Z12RENDER_Resetv+1BE, _Z16VGA_SetupDrawingj+3F7, _Z12PIC_RunQueuev+E6, _Z13TIMER_AddTickv+56, DOSBOX.O:_Z11Normal_Loopv+C, _Z17DOSBOX_RunMachinev+9, _Z19CALLBACK_RunRealInth+44, _ZN10device_CON4ReadEPhPt+76, _ZN10DOS_Device4ReadEPhPt+16, _Z12DOS_ReadFiletPhPt+8E, _ZN9DOS_Shell12InputCommandEPc+6E, XrmStringToQuark+3B, _XlcGetLocaleDataBase+23, _ZNSs4_Rep9_S_createEjRKSaIcE+56, _ZNSt24__default_alloc_templateILb1ELi0EE10deallocateEPvj+43, _ZNSt4listISsSaISsEE5eraseESt14_List_iteratorISsRSsPSsE+41, _ZNSs15_M_replace_safeIN9__gnu_cxx17__normal_iteratorIPcSsEEEERSsS3_S3_T_S5_+42, _Z17DOS_GetCurrentDirhPc+42, _ZN9DOS_Shell10ShowPromptEv+43, _ZN9DOS_Shell9ParseLineEPc+B7, _ZNSs7replaceEjjPKcj+C3, _ZN9DOS_Shell3RunEv+CD, LIBX11.A/LCGENERIC.O:read_segmentconversion+7F, _Z10SHELL_Initv+713, _Znwj+19, _ZN5MOUNT3RunEv+19, vga_initf+1, _ZNSt24__default_alloc_templateILb1ELi0EE8allocateEj+6F, _Znaj+8, _ZN13CKeyBindGroupC1Ej+92, _ZN11CommandLine9FindExistEPKcb+27, GUI/LIBGUI.A/SDL_MAPPER.O:_Z16CreateBindGroupsv+6E, _ZN6Config7StartUpEv+6, main+354

A possible patch (you need to check it that it really works):
--- src/video/x11/SDL_x11video.c_       2008-03-24 01:15:46.000000000 +0200
+++ src/video/x11/SDL_x11video.c        2008-03-24 01:15:51.000000000 +0200
@@ -232,7 +232,7 @@
        /* Ack!  Lost X11 connection! */

        /* We will crash if we try to clean up our display */
-       if ( current_video->hidden->Ximage ) {
+       if ( current_video->hidden->Ximage && SDL_VideoSurface ) {
                SDL_VideoSurface->pixels = NULL;
        }
        current_video->hidden->X11_Display = NULL;
Comment 1 Ryan C. Gordon 2009-09-13 16:33:39 UTC 
Tagging this bug with "target-1.2.14" so we can try to resolve it for SDL 1.2.14.

Please note that we may choose to resolve it as WONTFIX. This tag is largely so we have a comprehensive wishlist of bugs to examine for 1.2.14 (and so we can close bugs that we'll never fix, rather than have them live forever in Bugzilla).

--ryan.
Comment 2 Sam Lantinga 2009-09-21 01:00:05 UTC 
Thanks, your patch certainly can't hurt!  I applied it to subversion.