From: Dan Carpenter dan.carpenter@linaro.org

stable inclusion from stable-v5.10.201 commit ddf4e04e946aaa6c458b8b6829617cc44af2bffd category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9DFT4 CVE: CVE-2023-52846

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

--------------------------------

[ Upstream commit 876f8ab52363f649bcc74072157dfd7adfbabc0d ]

The prp_fill_rct() function can fail. In that situation, it frees the skb and returns NULL. Meanwhile on the success path, it returns the original skb. So it's straight forward to fix bug by using the returned value.

Fixes: 451d8123f897 ("net: prp: add packet handling support") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Acked-by: Paolo Abeni pabeni@redhat.com Link: https://lore.kernel.org/r/57af1f28-7f57-4a96-bcd3-b7a0f2340845@moroto.mounta... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: sanglipeng sanglipeng1@jd.com Signed-off-by: Yue Haibing yuehaibing@huawei.com --- net/hsr/hsr_forward.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index baf4765be6d7..4d1a2a48cf3f 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -294,9 +294,7 @@ struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame, skb = skb_copy_expand(frame->skb_std, 0, skb_tailroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC); - prp_fill_rct(skb, frame, port); - - return skb; + return prp_fill_rct(skb, frame, port); }

static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,