FAILED: patch "[PATCH] RDMA/mana: Remove user triggerable WARN_ON() in" failed to apply to 6.12-stable tree

FAILED: patch "[PATCH] RDMA/mana: Remove user triggerable WARN_ON() in" failed to apply to 6.12-stable tree

[gregkh]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 159f2efabc89d3f931d38f2d35876535d4abf0a3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026051229-jelly-reverence-0bf5@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 159f2efabc89d3f931d38f2d35876535d4abf0a3 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgg@ziepe.ca>
Date: Tue, 28 Apr 2026 13:17:38 -0300
Subject: [PATCH] RDMA/mana: Remove user triggerable WARN_ON() in
 mana_ib_create_qp_rss()

Sashiko points out that the user can specify WQs sharing the same CQ as a
part of the uAPI and this will trigger the WARN_ON() then go on to corrupt
the kernel.

Just reject it outright and fail the QP creation.

Cc: stable@vger.kernel.org
Fixes: c15d7802a424 ("RDMA/mana_ib: Add CQ interrupt support for RAW QP")
Link: https://sashiko.dev/#/patchset/0-v2-1c49eeb88c48%2B91-rdma_udata_rep_jgg%40nvidia.com?part=1
Link: https://patch.msgid.link/r/5-v1-41f3135e5565+9d2-rdma_ai_fixes1_jgg@nvidia.com
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/hw/mana/cq.c b/drivers/infiniband/hw/mana/cq.c
index f4cbe21763bf..2d682428ef20 100644
--- a/drivers/infiniband/hw/mana/cq.c
+++ b/drivers/infiniband/hw/mana/cq.c
@@ -137,8 +137,9 @@ int mana_ib_install_cq_cb(struct mana_ib_dev *mdev, struct mana_ib_cq *cq)
 
 	if (cq->queue.id >= gc->max_num_cqs)
 		return -EINVAL;
-	/* Create CQ table entry */
-	WARN_ON(gc->cq_table[cq->queue.id]);
+	/* Create CQ table entry, sharing a CQ between WQs is not supported */
+	if (gc->cq_table[cq->queue.id])
+		return -EINVAL;
 	if (cq->queue.kmem)
 		gdma_cq = cq->queue.kmem;
 	else