This is a note to let you know that I've just added the patch titled tipc: check skb_linearize() return value in tipc_disc_rcv() to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tipc-check-skb_linearize-return-value-in-tipc_disc_r.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit ead71705b8b955516c7e7bdff573e11ae0c9a6d8 Author: YueHaibing <yuehaibing@xxxxxxxxxx> Date: Sat Nov 19 15:28:32 2022 +0800 tipc: check skb_linearize() return value in tipc_disc_rcv() [ Upstream commit cd0f6421162201e4b22ce757a1966729323185eb ] If skb_linearize() fails in tipc_disc_rcv(), we need to free the skb instead of handle it. Fixes: 25b0b9c4e835 ("tipc: handle collisions of 32-bit node address hash values") Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx> Acked-by: Jon Maloy <jmaloy@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221119072832.7896-1-yuehaibing@xxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/tipc/discover.c b/net/tipc/discover.c index e8630707901e..e8dcdf267c0c 100644 --- a/net/tipc/discover.c +++ b/net/tipc/discover.c @@ -211,7 +211,10 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb, u32 self; int err; - skb_linearize(skb); + if (skb_linearize(skb)) { + kfree_skb(skb); + return; + } hdr = buf_msg(skb); if (caps & TIPC_NODE_ID128)