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Message-ID: <20250904072537.2278210-1-edumazet@google.com>
Date: Thu, 4 Sep 2025 07:25:37 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: Casey Schaufler <casey@...aufler-ca.com>, Paul Moore <paul@...l-moore.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
Eric Dumazet <eric.dumazet@...il.com>, Eric Dumazet <edumazet@...gle.com>,
syzbot+bb185b018a51f8d91fd2@...kaller.appspotmail.com,
Eric Paris <eparis@...hat.com>, audit@...r.kernel.org
Subject: [PATCH] audit: init ab->skb_list earlier in audit_buffer_alloc()
syzbot found a bug in audit_buffer_alloc() if nlmsg_new() returns NULL.
We need to initialize ab->skb_list before calling audit_buffer_free()
which will use both the skb_list spinlock and list pointers.
Fixes: eb59d494eebd ("audit: add record for multiple task security contexts")
Reported-by: syzbot+bb185b018a51f8d91fd2@...kaller.appspotmail.com
Closes: https://lore.kernel.org/lkml/68b93e3c.a00a0220.eb3d.0000.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Casey Schaufler <casey@...aufler-ca.com>
Cc: Paul Moore <paul@...l-moore.com>
Cc: Eric Paris <eparis@...hat.com>
Cc: audit@...r.kernel.org
---
kernel/audit.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index bd7474fd8d2c..707483879648 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1831,11 +1831,12 @@ static struct audit_buffer *audit_buffer_alloc(struct audit_context *ctx,
if (!ab)
return NULL;
+ skb_queue_head_init(&ab->skb_list);
+
ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
if (!ab->skb)
goto err;
- skb_queue_head_init(&ab->skb_list);
skb_queue_tail(&ab->skb_list, ab->skb);
if (!nlmsg_put(ab->skb, 0, 0, type, 0, 0))
--
2.51.0.338.gd7d06c2dae-goog
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