From: Xin Long lucien.xin@gmail.com

stable inclusion from stable-v4.19.314 commit 01cd1b7b685751ee422d00d050292a3d277652d6 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9US4T CVE: CVE-2024-36954

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 97bf6f81b29a8efaf5d0983251a7450e5794370d ]

__skb_linearize() doesn't free the skb when it fails, so move '*buf = NULL' after __skb_linearize(), so that the skb can be freed on the err path.

Fixes: b7df21cf1b79 ("tipc: skb_linearize the head skb when reassembling msgs") Reported-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Xin Long lucien.xin@gmail.com Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Tung Nguyen tung.q.nguyen@dektech.com.au Link: https://lore.kernel.org/r/90710748c29a1521efac4f75ea01b3b7e61414cf.171448581... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zhengchao Shao shaozhengchao@huawei.com --- net/tipc/msg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/msg.c b/net/tipc/msg.c index 0ac270444974..911b8f431985 100644 --- a/net/tipc/msg.c +++ b/net/tipc/msg.c @@ -140,9 +140,9 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf) if (fragid == FIRST_FRAGMENT) { if (unlikely(head)) goto err; - *buf = NULL; if (skb_has_frag_list(frag) && __skb_linearize(frag)) goto err; + *buf = NULL; frag = skb_unshare(frag, GFP_ATOMIC); if (unlikely(!frag)) goto err;