netdev - [PATCH] octeontx2-af: Fix use of uninitialized pointer bmap

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Date:   Fri, 24 Jul 2020 16:06:57 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] octeontx2-af: Fix use of uninitialized pointer bmap

If req->ctype does not match any of NIX_AQ_CTYPE_CQ,
NIX_AQ_CTYPE_SQ or NIX_AQ_CTYPE_RQ, pointer bmap will remain
uninitialized and be accessed in test_bit(), which can lead
to kernal crash.

Fix this by returning an error code if this case is triggered.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index 36953d4f51c7..20a64ed24474 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
@@ -869,19 +869,18 @@ static int nix_lf_hwctx_disable(struct rvu *rvu, struct hwctx_disable_req *req)
 		aq_req.cq_mask.bp_ena = 1;
 		q_cnt = pfvf->cq_ctx->qsize;
 		bmap = pfvf->cq_bmap;
-	}
-	if (req->ctype == NIX_AQ_CTYPE_SQ) {
+	} else if (req->ctype == NIX_AQ_CTYPE_SQ) {
 		aq_req.sq.ena = 0;
 		aq_req.sq_mask.ena = 1;
 		q_cnt = pfvf->sq_ctx->qsize;
 		bmap = pfvf->sq_bmap;
-	}
-	if (req->ctype == NIX_AQ_CTYPE_RQ) {
+	} else if (req->ctype == NIX_AQ_CTYPE_RQ) {
 		aq_req.rq.ena = 0;
 		aq_req.rq_mask.ena = 1;
 		q_cnt = pfvf->rq_ctx->qsize;
 		bmap = pfvf->rq_bmap;
-	}
+	} else
+		return NIX_AF_ERR_AQ_ENQUEUE;
 
 	aq_req.ctype = req->ctype;
 	aq_req.op = NIX_AQ_INSTOP_WRITE;
-- 
2.17.1