This is a note to let you know that I've just added the patch titled RDMA/cxgb4: Fix potential null-ptr-deref in pass_establish() to the 6.2-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: rdma-cxgb4-fix-potential-null-ptr-deref-in-pass_esta.patch and it can be found in the queue-6.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 1c066f53c4a4a677b0b823d6f4f0985d1be73ca2 Author: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx> Date: Thu Feb 2 10:48:50 2023 -0800 RDMA/cxgb4: Fix potential null-ptr-deref in pass_establish() [ Upstream commit 283861a4c52c1ea4df3dd1b6fc75a50796ce3524 ] If get_ep_from_tid() fails to lookup non-NULL value for ep, ep is dereferenced later regardless of whether it is empty. This patch adds a simple sanity check to fix the issue. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 944661dd97f4 ("RDMA/iw_cxgb4: atomically lookup ep and get a reference") Signed-off-by: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230202184850.29882-1-n.zhandarovich@xxxxxxxxxx Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index ea3ddf0d24114..ced615b5ea096 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -2676,6 +2676,9 @@ static int pass_establish(struct c4iw_dev *dev, struct sk_buff *skb) u16 tcp_opt = ntohs(req->tcp_opt); ep = get_ep_from_tid(dev, tid); + if (!ep) + return 0; + pr_debug("ep %p tid %u\n", ep, ep->hwtid); ep->snd_seq = be32_to_cpu(req->snd_isn); ep->rcv_seq = be32_to_cpu(req->rcv_isn);