tree b5fad542ee38ad43fcd99a3c83c993c17b863d22
parent 21f25cdb9e476c64d504981133d0552f7d155805
author Kautuk Consul <consul.kautuk@gmail.com> 1316476392 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> 1321032917 -0800

xhci-mem.c: Check for ring->first_seg != NULL

commit 0e6c7f746ea99089fb3263709075c20485a479ae upstream.

There are 2 situations wherein the xhci_ring* might not get freed:
- When xhci_ring_alloc() -> xhci_segment_alloc() returns NULL and
  we goto the fail: label in xhci_ring_alloc. In this case, the ring
  will not get kfreed.
- When the num_segs argument to xhci_ring_alloc is passed as 0 and
  we try to free the rung after that.
  ( This doesn't really happen as of now in the code but we seem to
    be entertaining num_segs=0 in xhci_ring_alloc )

This should be backported to kernels as old as 2.6.31.

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>