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Subject[PATCH 4.9 31/75] ptr_ring: add barriers
4.9-stable review patch.  If anyone has any objections, please let me know.


From: "Michael S. Tsirkin" <>

[ Upstream commit a8ceb5dbfde1092b466936bca0ff3be127ecf38e ]

Users of ptr_ring expect that it's safe to give the
data structure a pointer and have it be available
to consumers, but that actually requires an smb_wmb
or a stronger barrier.

In absence of such barriers and on architectures that reorder writes,
consumer might read an un=initialized value from an skb pointer stored
in the skb array. This was observed causing crashes.

To fix, add memory barriers. The barrier we use is a wmb, the
assumption being that producers do not need to read the value so we do
not need to order these reads.

Reported-by: George Cherian <>
Suggested-by: Jason Wang <>
Signed-off-by: Michael S. Tsirkin <>
Acked-by: Jason Wang <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
include/linux/ptr_ring.h | 9 +++++++++
1 file changed, 9 insertions(+)

--- a/include/linux/ptr_ring.h
+++ b/include/linux/ptr_ring.h
@@ -99,12 +99,18 @@ static inline bool ptr_ring_full_bh(stru

/* Note: callers invoking this in a loop must use a compiler barrier,
* for example cpu_relax(). Callers must hold producer_lock.
+ * Callers are responsible for making sure pointer that is being queued
+ * points to a valid data.
static inline int __ptr_ring_produce(struct ptr_ring *r, void *ptr)
if (unlikely(!r->size) || r->queue[r->producer])
return -ENOSPC;

+ /* Make sure the pointer we are storing points to a valid data. */
+ /* Pairs with smp_read_barrier_depends in __ptr_ring_consume. */
+ smp_wmb();
r->queue[r->producer++] = ptr;
if (unlikely(r->producer >= r->size))
r->producer = 0;
@@ -244,6 +250,9 @@ static inline void *__ptr_ring_consume(s
if (ptr)

+ /* Make sure anyone accessing data through the pointer is up to date. */
+ /* Pairs with smp_wmb in __ptr_ring_produce. */
+ smp_read_barrier_depends();
return ptr;

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