From c42b51ed9615e4f963153a580246d8df87b0b00d Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Sat, 23 Feb 2013 23:15:38 +0000
Subject: GHOST/X11 - free memory allocated by XF86VidModeGetAllModeLines(),
 Comment from Zr says this crashes but looks like this was because there was
 no check if the function failed to allocate to begin with.

---
 intern/ghost/intern/GHOST_DisplayManagerX11.cpp | 67 ++++++++++++-------------
 1 file changed, 31 insertions(+), 36 deletions(-)

(limited to 'intern')

diff --git a/intern/ghost/intern/GHOST_DisplayManagerX11.cpp b/intern/ghost/intern/GHOST_DisplayManagerX11.cpp
index 8d5ac9d77eb..7830f42cbb7 100644
--- a/intern/ghost/intern/GHOST_DisplayManagerX11.cpp
+++ b/intern/ghost/intern/GHOST_DisplayManagerX11.cpp
@@ -81,9 +81,9 @@ getNumDisplaySettings(
 		return GHOST_kFailure;
 	}
 
-	/* The X11 man page says vidmodes needs to be freed, but doing so causes a
-	 * segfault. - z0r */
-	XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &numSettings, &vidmodes);
+	if (XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &numSettings, &vidmodes)) {
+		XFree(vidmodes);
+	}
 
 #else
 	/* We only have one X11 setting at the moment. */
@@ -112,50 +112,46 @@ getDisplaySetting(
 		GHOST_TInt32 index,
 		GHOST_DisplaySetting& setting) const
 {
+	Display *dpy = m_system->getXDisplay();
+
+	if (dpy == NULL)
+		return GHOST_kFailure;
 
 #ifdef WITH_X11_XF86VMODE
 	int majorVersion, minorVersion;
-	XF86VidModeModeInfo **vidmodes;
-	Display *dpy = m_system->getXDisplay();
-	int numSettings;
 
 	GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");
 
-	if (dpy == NULL)
-		return GHOST_kFailure;
-
 	majorVersion = minorVersion = 0;
-	if (!XF86VidModeQueryVersion(dpy, &majorVersion, &minorVersion)) {
-		fprintf(stderr, "Error: XF86VidMode extension missing!\n");
-		return GHOST_kFailure;
-	}
+	if (XF86VidModeQueryVersion(dpy, &majorVersion, &minorVersion)) {
+		XF86VidModeModeInfo **vidmodes;
+		int numSettings;
 
-	/* The X11 man page says vidmodes needs to be freed, but doing so causes a
-	 * segfault. - z0r */
-	XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &numSettings, &vidmodes);
-	GHOST_ASSERT(index < numSettings, "Requested setting outside of valid range.\n");
+		if (XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &numSettings, &vidmodes)) {
+			GHOST_ASSERT(index < numSettings, "Requested setting outside of valid range.\n");
 
-	setting.xPixels = vidmodes[index]->hdisplay;
-	setting.yPixels = vidmodes[index]->vdisplay;
-	setting.bpp = DefaultDepth(dpy, DefaultScreen(dpy));
-	setting.frequency = (float)calculate_rate(vidmodes[index]);
+			setting.xPixels = vidmodes[index]->hdisplay;
+			setting.yPixels = vidmodes[index]->vdisplay;
+			setting.bpp = DefaultDepth(dpy, DefaultScreen(dpy));
+			setting.frequency = calculate_rate(vidmodes[index]);
+			XFree(vidmodes);
+
+			return GHOST_kSuccess;
+		}
+	}
+	else {
+		fprintf(stderr, "Warning: XF86VidMode extension missing!\n");
+		/* fallback to non xf86vmode below */
+	}
+#endif  /* WITH_X11_XF86VMODE */
 
-#else
 	GHOST_ASSERT(display < 1, "Only single display systems are currently supported.\n");
 	GHOST_ASSERT(index < 1, "Requested setting outside of valid range.\n");
-	
-	Display *x_display = m_system->getXDisplay();
-
-	if (x_display == NULL) {
-		return GHOST_kFailure;
-	}
 
-	setting.xPixels  = DisplayWidth(x_display, DefaultScreen(x_display));
-	setting.yPixels = DisplayHeight(x_display, DefaultScreen(x_display));
-	setting.bpp = DefaultDepth(x_display, DefaultScreen(x_display));
+	setting.xPixels  = DisplayWidth(dpy, DefaultScreen(dpy));
+	setting.yPixels = DisplayHeight(dpy, DefaultScreen(dpy));
+	setting.bpp = DefaultDepth(dpy, DefaultScreen(dpy));
 	setting.frequency = 60.0f;
-#endif
-
 
 	return GHOST_kSuccess;
 }
@@ -180,9 +176,8 @@ setCurrentDisplaySetting(
 		const GHOST_DisplaySetting& setting)
 {
 #ifdef WITH_X11_XF86VMODE
-	/* Mode switching code ported from Quake 2:
-	 * ftp: ftp.idsoftware.com/idstuff/source/q2source-3.21.zip
-	 * See linux/gl_glx.c:GLimp_SetMode
+	/* Mode switching code ported from SDL:
+	 * See: src/video/x11/SDL_x11modes.c:set_best_resolution
 	 */
 	int majorVersion, minorVersion;
 	XF86VidModeModeInfo **vidmodes;
-- 
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