[gtk+/gtk-2-18] Prevent a crash in the TGA loader

[Matthias Clasen <matthiasc src gnome org>]

commit 4623a485c7d2eeffe3ed5d89d1b3359cc8e9f495
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 23 11:50:25 2010 -0500

    Prevent a crash in the TGA loader
    
    Reported in bug 609744.
    (cherry picked from commit 33330ab332ed1056d965a982a2fdd7adebddac30)

 gdk-pixbuf/io-tga.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/gdk-pixbuf/io-tga.c b/gdk-pixbuf/io-tga.c
index e42758c..0391e1e 100644
--- a/gdk-pixbuf/io-tga.c
+++ b/gdk-pixbuf/io-tga.c
@@ -679,7 +679,13 @@ static gboolean try_colormap(TGAContext *ctx, GError **err)
 	static guint n;
 
 	g_return_val_if_fail(ctx != NULL, FALSE);
-	g_return_val_if_fail(ctx->cmap_size > 0, TRUE);
+
+        if (ctx->cmap_size == 0) {
+		g_set_error_literal(err, GDK_PIXBUF_ERROR,
+                                    GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
+                                    _("Image is corrupted or truncated"));
+			return FALSE;
+        }
 
 	ctx->cmap = g_try_malloc(sizeof(TGAColormap));
 	if (!ctx->cmap) {