netdev - [PATCH] octeontx2-af: fix a use-after-free in rvu_nix_register

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Date: Thu,  7 Dec 2023 17:49:16 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Sunil Goutham <sgoutham@...vell.com>,
	Linu Cherian <lcherian@...vell.com>,
	Geetha sowjanya <gakula@...vell.com>,
	Jerin Jacob <jerinj@...vell.com>,
	hariprasad <hkelam@...vell.com>,
	Subbaraya Sundeep <sbhatta@...vell.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	George Cherian <george.cherian@...vell.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] octeontx2-af: fix a use-after-free in rvu_nix_register_reporters

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@....edu.cn>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
index c70932625d0d..f0308d7716e1 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
@@ -538,7 +538,7 @@ 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);
@@ -546,9 +546,6 @@ 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)
-- 
2.34.1