linux-kernel - [PATCH 4.19 149/421] ieee802154: hwsim: avoid possible crash in hwsim_del_edge

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Message-Id: <20210719144951.641353844@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:49:20 +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, Eric Dumazet <edumazet@...gle.com>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        syzbot <syzkaller@...glegroups.com>,
        Alexander Aring <aahringo@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 149/421] ieee802154: hwsim: avoid possible crash in hwsim_del_edge_nl()

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 0303b30375dff5351a79cc2c3c87dfa4fda29bed ]

Both MAC802154_HWSIM_ATTR_RADIO_ID and MAC802154_HWSIM_ATTR_RADIO_EDGE
must be present to avoid a crash.

Fixes: f25da51fdc38 ("ieee802154: hwsim: add replacement for fakelb")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Alexander Aring <alex.aring@...il.com>
Cc: Stefan Schmidt <stefan@...enfreihafen.org>
Reported-by: syzbot <syzkaller@...glegroups.com>
Acked-by: Alexander Aring <aahringo@...hat.com>
Link: https://lore.kernel.org/r/20210621180244.882076-1-eric.dumazet@gmail.com
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ieee802154/mac802154_hwsim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
index 6cda4aa4f680..06aadebc2d5b 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.c
+++ b/drivers/net/ieee802154/mac802154_hwsim.c
@@ -496,7 +496,7 @@ static int hwsim_del_edge_nl(struct sk_buff *msg, struct genl_info *info)
 	struct hwsim_edge *e;
 	u32 v0, v1;
 
-	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] &&
+	if (!info->attrs[MAC802154_HWSIM_ATTR_RADIO_ID] ||
 	    !info->attrs[MAC802154_HWSIM_ATTR_RADIO_EDGE])
 		return -EINVAL;
 
-- 
2.30.2