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Segmentation faults or undefined behaviour may result from a NULL pointer dereference in strip_trailing_digits() and grub_util_devname_to_ofpath() if strdup() fails. Therefore, I added a NULL check to fix this. Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com> Reviewed-by: Srish Srinivasan <ssrish@linux.ibm.com> Reviewed-by: Avnish Chouhan <avnish@linux.ibm.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>