Patch "RDMA/srpt: Add a check for valid 'mad_agent' pointer" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    RDMA/srpt: Add a check for valid 'mad_agent' pointer

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rdma-srpt-add-a-check-for-valid-mad_agent-pointer.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a1edbeea177e762751e6f9cb882c17227a40a717
Author: Saravanan Vajravel <saravanan.vajravel@xxxxxxxxxxxx>
Date:   Wed Apr 5 21:25:49 2023 -0700

    RDMA/srpt: Add a check for valid 'mad_agent' pointer
    
    [ Upstream commit eca5cd9474cd26d62f9756f536e2e656d3f62f3a ]
    
    When unregistering MAD agent, srpt module has a non-null check
    for 'mad_agent' pointer before invoking ib_unregister_mad_agent().
    This check can pass if 'mad_agent' variable holds an error value.
    The 'mad_agent' can have an error value for a short window when
    srpt_add_one() and srpt_remove_one() is executed simultaneously.
    
    In srpt module, added a valid pointer check for 'sport->mad_agent'
    before unregistering MAD agent.
    
    This issue can hit when RoCE driver unregisters ib_device
    
    Stack Trace:
    ------------
    BUG: kernel NULL pointer dereference, address: 000000000000004d
    PGD 145003067 P4D 145003067 PUD 2324fe067 PMD 0
    Oops: 0002 [#1] PREEMPT SMP NOPTI
    CPU: 10 PID: 4459 Comm: kworker/u80:0 Kdump: loaded Tainted: P
    Hardware name: Dell Inc. PowerEdge R640/06NR82, BIOS 2.5.4 01/13/2020
    Workqueue: bnxt_re bnxt_re_task [bnxt_re]
    RIP: 0010:_raw_spin_lock_irqsave+0x19/0x40
    Call Trace:
      ib_unregister_mad_agent+0x46/0x2f0 [ib_core]
      IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
      ? __schedule+0x20b/0x560
      srpt_unregister_mad_agent+0x93/0xd0 [ib_srpt]
      srpt_remove_one+0x20/0x150 [ib_srpt]
      remove_client_context+0x88/0xd0 [ib_core]
      bond0: (slave p2p1): link status definitely up, 100000 Mbps full duplex
      disable_device+0x8a/0x160 [ib_core]
      bond0: active interface up!
      ? kernfs_name_hash+0x12/0x80
     (NULL device *): Bonding Info Received: rdev: 000000006c0b8247
      __ib_unregister_device+0x42/0xb0 [ib_core]
     (NULL device *):         Master: mode: 4 num_slaves:2
      ib_unregister_device+0x22/0x30 [ib_core]
     (NULL device *):         Slave: id: 105069936 name:p2p1 link:0 state:0
      bnxt_re_stopqps_and_ib_uninit+0x83/0x90 [bnxt_re]
      bnxt_re_alloc_lag+0x12e/0x4e0 [bnxt_re]
    
    Fixes: a42d985bd5b2 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
    Reviewed-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
    Reviewed-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
    Signed-off-by: Saravanan Vajravel <saravanan.vajravel@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230406042549.507328-1-saravanan.vajravel@xxxxxxxxxxxx
    Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
    Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 7b69b0c9e48d9..38494943bd748 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -549,6 +549,7 @@ static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid)
  */
 static int srpt_refresh_port(struct srpt_port *sport)
 {
+	struct ib_mad_agent *mad_agent;
 	struct ib_mad_reg_req reg_req;
 	struct ib_port_modify port_modify;
 	struct ib_port_attr port_attr;
@@ -593,24 +594,26 @@ static int srpt_refresh_port(struct srpt_port *sport)
 		set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
 		set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
 
-		sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
-							 sport->port,
-							 IB_QPT_GSI,
-							 &reg_req, 0,
-							 srpt_mad_send_handler,
-							 srpt_mad_recv_handler,
-							 sport, 0);
-		if (IS_ERR(sport->mad_agent)) {
+		mad_agent = ib_register_mad_agent(sport->sdev->device,
+						  sport->port,
+						  IB_QPT_GSI,
+						  &reg_req, 0,
+						  srpt_mad_send_handler,
+						  srpt_mad_recv_handler,
+						  sport, 0);
+		if (IS_ERR(mad_agent)) {
 			pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n",
 			       dev_name(&sport->sdev->device->dev), sport->port,
-			       PTR_ERR(sport->mad_agent));
+			       PTR_ERR(mad_agent));
 			sport->mad_agent = NULL;
 			memset(&port_modify, 0, sizeof(port_modify));
 			port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
 			ib_modify_port(sport->sdev->device, sport->port, 0,
 				       &port_modify);
-
+			return 0;
 		}
+
+		sport->mad_agent = mad_agent;
 	}
 
 	return 0;