Fetch libexif 0.6.21 to include the security fixes.

libexif/sources/libexif/exif-data.h

 /*! \file exif-data.h
  * \brief Defines the ExifData type and the associated functions.
  */
 /*
  * \author Lutz Mueller <lutz@users.sourceforge.net>
  * \date 2001-2005
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 77 matching lines @@
  * \param[in] data pointer to raw JPEG or EXIF data
  * \param[in] size number of bytes of data at data
  * \return allocated #ExifData, or NULL on error
  */
 ExifData *exif_data_new_from_data (const unsigned char *data,
                                    unsigned int size);
 
 /*! Load the #ExifData structure from the raw JPEG or EXIF data in the given
  * memory buffer. If the EXIF data contains a recognized MakerNote, it is
  * loaded and stored as well for later retrieval by #exif_data_get_mnote_data.
- * If the EXIF_DATA_OPTION_FOLLOW_SPECIFICATION has been set on this #ExifData,
- * then the tags are fixed after loading.
+ * If the #EXIF_DATA_OPTION_FOLLOW_SPECIFICATION option has been set on this
+ * #ExifData, then the tags are automatically fixed after loading (by calling
+ * #exif_data_fix).
  *
  * \param[in,out] data EXIF data
  * \param[in] d pointer to raw JPEG or EXIF data
  * \param[in] size number of bytes of data at d
  */
 void      exif_data_load_data (ExifData *data, const unsigned char *d, 
                                unsigned int size);
 
 /*! Store raw EXIF data representing the #ExifData structure into a memory
  * buffer. The buffer is allocated by this function and must subsequently be
@@ skipping 145 matching lines @@
          exif_content_get_entry(d->ifd[EXIF_IFD_GPS],t) ?               \
          exif_content_get_entry(d->ifd[EXIF_IFD_GPS],t) :               \
          exif_content_get_entry(d->ifd[EXIF_IFD_INTEROPERABILITY],t) ?  \
          exif_content_get_entry(d->ifd[EXIF_IFD_INTEROPERABILITY],t) : NULL)
 
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
 
 #endif /* __EXIF_DATA_H__ */