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Message-ID: <0000000000006249bd0613778910@google.com>
Date: Tue, 12 Mar 2024 07:33:07 -0700
From: syzbot <syzbot+2ef3a8ce8e91b5a50098@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Test for 2ef3a8ce8e91b5a50098
For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.
***
Subject: Test for 2ef3a8ce8e91b5a50098
Author: syoshida@...hat.com
#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9f8413c4a66f2fb776d3dc3c9ed20bf435eb305e
diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 6d14d935ee82..b983232e25cb 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -228,6 +228,9 @@ struct hsr_node *hsr_get_node(struct hsr_port *port, struct list_head *node_db,
*/
if (ethhdr->h_proto == htons(ETH_P_PRP) ||
ethhdr->h_proto == htons(ETH_P_HSR)) {
+ if (skb->mac_len < sizeof(struct hsr_ethhdr))
+ return NULL;
+
/* Use the existing sequence_nr from the tag as starting point
* for filtering duplicate frames.
*/
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