[RTEMS Project] #2375: tftpDriver free's current_directory

RTEMS trac trac at rtems.org
Tue Jul 21 17:39:16 UTC 2015

#2375: tftpDriver free's current_directory
 Reporter:  mdavidsaver  |      Owner:
     Type:  defect       |     Status:  new
 Priority:  normal       |  Milestone:  4.10.3
Component:  networking   |    Version:  4.10
 Severity:  normal       |   Keywords:
 It seems I've re-discovered this issue reported by Angus Gratton in 2010.


 I can confirm Angus' diagnosis.  In rtems_tftp_eval_path(),
 'pathloc->node_access' defaults to
 'rtems_current_user_env->current_directory'.  In some cases
 '->node_access' is replaced with a newly allocated string, in the others
 it is not.  Unfortunately rtems_tftp_free_node_info() happily free()s
 unless cwd==ROOT_NODE_ACCESS(fs).

 I chased this down with GDB and confirmed that, in my case, when
 cwd=='/epics/BOOTP_HOST/epics/myhost' the current directory string is
 free'd when open() fails to open a file, which results in:

 > > Program heap: free of bad pointer 358CE4 -- range 2A1C10 - 7EE0000

 when the following open() does the same.

Ticket URL: <http://devel.rtems.org/ticket/2375>
RTEMS Project <http://www.rtems.org/>
RTEMS Project

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