[dpdk-dev] [PATCH] bus/vmbus: calcuate the correct start address for mapping ring buffer

[longli at linuxonhyperv.com]

From: Long Li <longli at microsoft.com>

vmbus_map_addr is used as the next start virutal address for mapping ring
buffer. However it's updated based on ring_buf, which is a pointer to an
address on the stack. The next ring buffer may be mapped to an unexpected
address.

Fix this by calculating vmbus_map_addr based on returned virtual address.

Signed-off-by: Long Li <longli at microsoft.com>
---
 drivers/bus/vmbus/linux/vmbus_uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/vmbus/linux/vmbus_uio.c b/drivers/bus/vmbus/linux/vmbus_uio.c
index 5451bfd15..5dc0c47de 100644
--- a/drivers/bus/vmbus/linux/vmbus_uio.c
+++ b/drivers/bus/vmbus/linux/vmbus_uio.c
@@ -242,7 +242,7 @@ static int vmbus_uio_map_subchan(const struct rte_vmbus_device *dev,
 	*ring_size = file_size / 2;
 	*ring_buf = mapaddr;
 
-	vmbus_map_addr = RTE_PTR_ADD(ring_buf, file_size);
+	vmbus_map_addr = RTE_PTR_ADD(mapaddr, file_size);
 	return 0;
 }
 
-- 
2.25.1