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diff -urNp old/plug-ins/common/file-gbr.c new/plug-ins/common/file-gbr.c
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--- old/plug-ins/common/file-gbr.c	2018-01-04 12:13:17.553757864 +0100
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+++ new/plug-ins/common/file-gbr.c	2018-01-04 12:18:01.723635742 +0100
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@@ -443,7 +443,8 @@ load_image (const gchar  *filename,
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     {
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       gchar *temp = g_new (gchar, bn_size);
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-      if ((read (fd, temp, bn_size)) < bn_size)
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+      if ((read (fd, temp, bn_size)) < bn_size ||
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+          temp[bn_size - 1] != '\0')
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         {
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           g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
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                        _("Error in GIMP brush file '%s'"),