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Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Alexander Aring , netdev@vger.kernel.org, Xiang Mei , Weiming Shi Subject: [PATCH net] ipv6: rpl: add NULL check for idev in ipv6_rpl_srh_rcv() Date: Fri, 15 May 2026 05:55:30 -0700 Message-ID: <20260515125530.3396293-2-bestswngs@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ipv6_rpl_srh_rcv() calls __in6_dev_get(skb->dev) and dereferences the result without a NULL check. When addrconf_ifdown() concurrently clears dev->ip6_ptr via RCU_INIT_POINTER(dev->ip6_ptr, NULL), __in6_dev_get() returns NULL and the subsequent READ_ONCE(idev->cnf.rpl_seg_enabled) triggers a NULL pointer dereference. BUG: kernel NULL pointer dereference, address: 0000000000000370 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:ipv6_rthdr_rcv+0x3bf/0xe70 ipv6_rpl_srh_rcv (net/ipv6/exthdrs.c:504) ipv6_rthdr_rcv (net/ipv6/exthdrs.c:691) ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:478) ip6_input_finish (net/ipv6/ip6_input.c:532) ip6_input (net/ipv6/ip6_input.c:540) Add a NULL check for idev, dropping the packet when the device has no IPv6 configuration. Fixes: 8610c7c6e3bd ("net: ipv6: add support for rpl sr exthdr") Reported-by: Xiang Mei Signed-off-by: Weiming Shi --- net/ipv6/exthdrs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 95558fd6f447..19002e551a03 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -498,6 +498,10 @@ static int ipv6_rpl_srh_rcv(struct sk_buff *skb) u32 r; idev = __in6_dev_get(skb->dev); + if (!idev) { + kfree_skb(skb); + return -1; + } accept_rpl_seg = min(READ_ONCE(net->ipv6.devconf_all->rpl_seg_enabled), READ_ONCE(idev->cnf.rpl_seg_enabled)); -- 2.43.0