netdev - [PATCH net-next] octeontx2-af: Fix uninitialized variable in debugfs

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Message-ID: <20191121092146.hnvdwnzpirskw3wr@kili.mountain>
Date:   Thu, 21 Nov 2019 12:21:46 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>
Cc:     Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] octeontx2-af: Fix uninitialized variable in debugfs

If rvu_get_blkaddr() fails, then this rvu_cgx_nix_cuml_stats() returns
zero and we write some uninitialized data into the debugfs output.

On the error paths, the use of the uninitialized "*stat" is harmless,
but it will lead to a Smatch warning (static analysis) and a UBSan
warning (runtime analysis) so we should prevent that as well.

Fixes: f967488d095e ("octeontx2-af: Add per CGX port level NIX Rx/Tx counters")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
index 0bbb2eb1446e..11e5921c55b9 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c
@@ -608,6 +608,8 @@ int rvu_cgx_nix_cuml_stats(struct rvu *rvu, void *cgxd, int lmac_id,
 	u16 pcifunc;
 	int pf, lf;
 
+	*stat = 0;
+
 	if (!cgxd || !rvu)
 		return -EINVAL;
 
@@ -624,7 +626,6 @@ int rvu_cgx_nix_cuml_stats(struct rvu *rvu, void *cgxd, int lmac_id,
 		return 0;
 	block = &rvu->hw->block[blkaddr];
 
-	*stat = 0;
 	for (lf = 0; lf < block->lf.max; lf++) {
 		/* Check if a lf is attached to this PF or one of its VFs */
 		if (!((block->fn_map[lf] & ~RVU_PFVF_FUNC_MASK) == (pcifunc &
-- 
2.11.0