linux-kernel - [PATCH 4.19 071/116] net: dsa: fix a crash if ->get_sset

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Date:   Mon, 31 May 2021 15:14:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 071/116] net: dsa: fix a crash if ->get_sset_count() fails

From: Dan Carpenter <dan.carpenter@...cle.com>

commit a269333fa5c0c8e53c92b5a28a6076a28cde3e83 upstream.

If ds->ops->get_sset_count() fails then it "count" is a negative error
code such as -EOPNOTSUPP.  Because "i" is an unsigned int, the negative
error code is type promoted to a very high value and the loop will
corrupt memory until the system crashes.

Fix this by checking for error codes and changing the type of "i" to
just int.

Fixes: badf3ada60ab ("net: dsa: Provide CPU port statistics to master netdev")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Reviewed-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/dsa/master.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/net/dsa/master.c
+++ b/net/dsa/master.c
@@ -87,8 +87,7 @@ static void dsa_master_get_strings(struc
 	struct dsa_switch *ds = cpu_dp->ds;
 	int port = cpu_dp->index;
 	int len = ETH_GSTRING_LEN;
-	int mcount = 0, count;
-	unsigned int i;
+	int mcount = 0, count, i;
 	uint8_t pfx[4];
 	uint8_t *ndata;
 
@@ -118,6 +117,8 @@ static void dsa_master_get_strings(struc
 		 */
 		ds->ops->get_strings(ds, port, stringset, ndata);
 		count = ds->ops->get_sset_count(ds, port, stringset);
+		if (count < 0)
+			return;
 		for (i = 0; i < count; i++) {
 			memmove(ndata + (i * len + sizeof(pfx)),
 				ndata + i * len, len - sizeof(pfx));