From 5fc01fb846bce8fa6d5f95e2625b8ce0f8e86810 Mon Sep 17 00:00:00 2001 From: Myungho Jung Date: Wed, 9 Jan 2019 22:27:31 -0800 Subject: [PATCH] RDMA/cma: Rollback source IP address if failing to acquire device If cma_acquire_dev_by_src_ip() returns error in addr_handler(), the device state changes back to RDMA_CM_ADDR_BOUND but the resolved source IP address is still left. After that, if rdma_destroy_id() is called after rdma_listen(), the device is freed without removed from listen_any_list in cma_cancel_operation(). Revert to the previous IP address if acquiring device fails. Reported-by: syzbot+f3ce716af730c8f96637@syzkaller.appspotmail.com Signed-off-by: Myungho Jung Reviewed-by: Parav Pandit Signed-off-by: Jason Gunthorpe --- drivers/infiniband/core/cma.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 63a7cc00bae0..8cd113b0ddfb 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -2963,13 +2963,22 @@ static void addr_handler(int status, struct sockaddr *src_addr, { struct rdma_id_private *id_priv = context; struct rdma_cm_event event = {}; + struct sockaddr *addr; + struct sockaddr_storage old_addr; mutex_lock(&id_priv->handler_mutex); if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_RESOLVED)) goto out; - memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr)); + /* + * Store the previous src address, so that if we fail to acquire + * matching rdma device, old address can be restored back, which helps + * to cancel the cma listen operation correctly. + */ + addr = cma_src_addr(id_priv); + memcpy(&old_addr, addr, rdma_addr_size(addr)); + memcpy(addr, src_addr, rdma_addr_size(src_addr)); if (!status && !id_priv->cma_dev) { status = cma_acquire_dev_by_src_ip(id_priv); if (status) @@ -2980,6 +2989,8 @@ static void addr_handler(int status, struct sockaddr *src_addr, } if (status) { + memcpy(addr, &old_addr, + rdma_addr_size((struct sockaddr *)&old_addr)); if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ADDR_BOUND)) goto out;