andreacavalli/xserver-multidpi
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Fix a use-after-free of cursor data by refcounting for the sprite.current

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reference. The particular path seen was XFixes' ReplaceCursor()
    resulting in the sprite.current being freed, but then it getting
    accessed during the ChangeToCursor() that happens as a result of
    WindowHasNewCursor().
This commit is contained in:
Eric Anholt 2005-08-25 22:11:04 +00:00
parent 54cc45b09b
commit ea80b5db25
1 changed files with 6 additions and 1 deletions
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7
dix/events.c
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@ -1,4 +1,4 @@
/* $XdotOrg: xc/programs/Xserver/dix/events.c,v 1.12 2005/06/15 16:46:59 daniels Exp $ */
/* $XdotOrg: xc/programs/Xserver/dix/events.c,v 1.16 2005/07/15 05:48:29 kem Exp $ */
/* $XFree86: xc/programs/Xserver/dix/events.c,v 3.51 2004/01/12 17:04:52 tsi Exp $ */
/************************************************************
@ -675,7 +675,9 @@ XineramaChangeToCursor(CursorPtr cursor)
(sprite.current->bits->yhot != cursor->bits->yhot))
XineramaCheckPhysLimits(cursor, FALSE);
(*sprite.screen->DisplayCursor)(sprite.screen, cursor);
FreeCursor(sprite.current, (Cursor)0);
sprite.current = cursor;
sprite.current->refcnt++;
}
}
@ -930,7 +932,9 @@ ChangeToCursor(CursorPtr cursor)
(ScreenPtr)NULL);
(*sprite.hotPhys.pScreen->DisplayCursor) (sprite.hotPhys.pScreen,
cursor);
FreeCursor(sprite.current, (Cursor)0);
sprite.current = cursor;
sprite.current->refcnt++;
}
}
@ -2184,6 +2188,7 @@ DefineInitialRootWindow(register WindowPtr win)
#endif
sprite.win = win;
sprite.current = wCursor (win);
sprite.current->refcnt++;
spriteTraceGood = 1;
ROOT = win;
(*pScreen->CursorLimits) (