From: Eric Dumazet <edumazet@google.com>
Date: Mon, 21 Jun 2021 18:02:44 +0000 (-0700)
Subject: ieee802154: hwsim: avoid possible crash in hwsim_del_edge_nl()
X-Git-Tag: v5.12.17~236
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7fe09bef9d2d3499db662359fe6eb3f67a257b4e;p=thirdparty%2Fkernel%2Fstable.git

ieee802154: hwsim: avoid possible crash in hwsim_del_edge_nl()

[ 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@google.com>
Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@datenfreihafen.org>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20210621180244.882076-1-eric.dumazet@gmail.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
index 6d479df2d9e5a..626e1ce817fcf 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.c
+++ b/drivers/net/ieee802154/mac802154_hwsim.c
@@ -480,7 +480,7 @@ 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;