octeontx2-af: fix a use-after-free in rvu_nix_register_reporters

[ Upstream commit 28a7cb045ab700de5554193a1642917602787784 ]

The rvu_dl will be freed in rvu_nix_health_reporters_destroy(rvu_dl)
after the create_workqueue fails, and after that free, the rvu_dl will
be translate back through the following call chain:

rvu_nix_health_reporters_destroy
  |-> rvu_nix_health_reporters_create
       |-> rvu_health_reporters_create
             |-> rvu_register_dl (label err_dl_health)

Finally. in the err_dl_health label, rvu_dl being freed again in
rvu_health_reporters_destroy(rvu) by rvu_nix_health_reporters_destroy.
In the second calls of rvu_nix_health_reporters_destroy, however,
it uses rvu_dl->rvu_nix_health_reporter, which is already freed at
the end of rvu_nix_health_reporters_destroy in the first call.

So this patch prevents the first destroy by instantly returning -ENONMEN
when create_workqueue fails. In addition, since the failure of
create_workqueue is the only entrence of label err, it has been
integrated into the error-handling path of create_workqueue.

Fixes: 5ed66306eab6 ("octeontx2-af: Add devlink health reporters for NIX")
Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
index 058f75d..bffe04e 100644 (file)
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
@@ -642,7 +642,7 @@ static int rvu_nix_register_reporters(struct rvu_devlink *rvu_dl)
 
        rvu_dl->devlink_wq = create_workqueue("rvu_devlink_wq");
        if (!rvu_dl->devlink_wq)
-               goto err;
+               return -ENOMEM;
 
        INIT_WORK(&rvu_reporters->intr_work, rvu_nix_intr_work);
        INIT_WORK(&rvu_reporters->gen_work, rvu_nix_gen_work);
@@ -650,9 +650,6 @@ static int rvu_nix_register_reporters(struct rvu_devlink *rvu_dl)
        INIT_WORK(&rvu_reporters->ras_work, rvu_nix_ras_work);
 
        return 0;
-err:
-       rvu_nix_health_reporters_destroy(rvu_dl);
-       return -ENOMEM;
 }
 
 static int rvu_nix_health_reporters_create(struct rvu_devlink *rvu_dl)