linux-kernel - [PATCH] xhci: fix null-pointer dereference when destroying half-built segment rings

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Date:	Mon, 29 Oct 2012 10:00:30 -0700
From:	Julius Werner <jwerner@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-usb@...r.kernel.org,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vincent Palatin <vpalatin@...omium.org>,
	Julius Werner <jwerner@...omium.org>
Subject: [PATCH] xhci: fix null-pointer dereference when destroying half-built segment rings

xhci_alloc_segments_for_ring() builds a list of xhci_segments and links
the tail to head at the end (forming a ring). When it bails out for OOM
reasons half-way through, it tries to destroy its half-built list with
xhci_free_segments_for_ring(), even though it is not a ring yet. This
causes a null-pointer dereference upon hitting the last element.

Furthermore, one of its callers (xhci_ring_alloc()) mistakenly believes
the output parameters to be valid upon this kind of OOM failure, and
calls xhci_ring_free() on them. Since the (incomplete) list/ring should
already be destroyed in that case, this would lead to a use after free.

This patch fixes those issues by having xhci_alloc_segments_for_ring()
destroy its half-built, non-circular list manually and destroying the
invalid struct xhci_ring in xhci_ring_alloc() with a plain kfree().

Signed-off-by: Julius Werner <jwerner@...omium.org>
---
 drivers/usb/host/xhci-mem.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 487bc08..420ba37 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -205,7 +205,11 @@ static int xhci_alloc_segments_for_ring(struct xhci_hcd *xhci,

 		next = xhci_segment_alloc(xhci, cycle_state, flags);
 		if (!next) {
-			xhci_free_segments_for_ring(xhci, *first);
+			prev = *first;
+			do {
+				next = prev->next;
+				xhci_segment_free(xhci, prev);
+			} while ((prev = next));
 			return -ENOMEM;
 		}
 		xhci_link_segments(xhci, prev, next, type);
@@ -258,7 +262,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
 	return ring;

 fail:
-	xhci_ring_free(xhci, ring);
+	kfree(ring);
 	return NULL;
 }

-- 
1.7.8.6

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