diff options
| author | Kautuk Consul <consul.kautuk@gmail.com> | 2011-09-19 16:53:12 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-20 12:40:31 -0700 |
| commit | 0e6c7f746ea99089fb3263709075c20485a479ae (patch) | |
| tree | 3b453455362557f872562ffac17c1d055c1caa2d /drivers | |
| parent | 10d674a82e553cb8a1f41027bb3c3e309b3f6804 (diff) | |
xhci-mem.c: Check for ring->first_seg != NULL
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>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 94a8b28d602e..e4513ab015b4 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -112,18 +112,20 @@ void xhci_ring_free(struct xhci_hcd *xhci, struct xhci_ring *ring) struct xhci_segment *seg; struct xhci_segment *first_seg; - if (!ring || !ring->first_seg) + if (!ring) return; - first_seg = ring->first_seg; - seg = first_seg->next; - xhci_dbg(xhci, "Freeing ring at %p\n", ring); - while (seg != first_seg) { - struct xhci_segment *next = seg->next; - xhci_segment_free(xhci, seg); - seg = next; + if (ring->first_seg) { + first_seg = ring->first_seg; + seg = first_seg->next; + xhci_dbg(xhci, "Freeing ring at %p\n", ring); + while (seg != first_seg) { + struct xhci_segment *next = seg->next; + xhci_segment_free(xhci, seg); + seg = next; + } + xhci_segment_free(xhci, first_seg); + ring->first_seg = NULL; } - xhci_segment_free(xhci, first_seg); - ring->first_seg = NULL; kfree(ring); } |