From: Prathamesh Deshpande <prathameshdeshpande7@gmail.com>
Date: Tue, 28 Apr 2026 22:42:49 +0000 (+0100)
Subject: RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=43f8f7946814c8e5f464518246fdbc69b6e32326;p=thirdparty%2Fkernel%2Flinux.git

RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference

MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list
before initializing the fields used by the shared error path.

If eventfd_ctx_fdget() then fails, the unwind path dereferences
event_sub->ev_file in uverbs_uobject_put() and calls
subscribe_event_xa_dealloc() with an unset xa_key_level1.

subscribe_event_xa_alloc() creates the XA entry exactly once for a given
key_level1, on the first occurrence of that key. The unwind path must
therefore call subscribe_event_xa_dealloc() exactly once for it as well.

Enforce that by adding devx_key_in_sub_list() and calling
subscribe_event_xa_dealloc() only when the last matching pending entry is
being cleaned up.

Fixes: 759738537142 ("IB/mlx5: Enable subscription for device events over DEVX")
Signed-off-by: Prathamesh Deshpande <prathameshdeshpande7@gmail.com>
Link: https://patch.msgid.link/20260428224319.37682-1-prathameshdeshpande7@gmail.com
Reviewed-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
---

diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c
index 645ebcc0832d7..c2ae5a1404711 100644
--- a/drivers/infiniband/hw/mlx5/devx.c
+++ b/drivers/infiniband/hw/mlx5/devx.c
@@ -1913,6 +1913,17 @@ sub_bytes:
 	return err;
 }
 
+static bool devx_key_in_sub_list(struct list_head *list, u32 key_level1)
+{
+	struct devx_event_subscription *s;
+
+	list_for_each_entry(s, list, event_list)
+		if (s->xa_key_level1 == key_level1)
+			return true;
+
+	return false;
+}
+
 static void
 subscribe_event_xa_dealloc(struct mlx5_devx_event_table *devx_event_table,
 			   u32 key_level1,
@@ -2160,10 +2171,17 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT)(
 
 		event_sub = kzalloc_obj(*event_sub);
 		if (!event_sub) {
+			if (!devx_key_in_sub_list(&sub_list, key_level1))
+				subscribe_event_xa_dealloc(devx_event_table,
+							   key_level1,
+							   obj,
+							   obj_id);
 			err = -ENOMEM;
 			goto err;
 		}
 
+		event_sub->ev_file = ev_file;
+		event_sub->xa_key_level1 = key_level1;
 		list_add_tail(&event_sub->event_list, &sub_list);
 		uverbs_uobject_get(&ev_file->uobj);
 		if (use_eventfd) {
@@ -2178,9 +2196,6 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT)(
 		}
 
 		event_sub->cookie = cookie;
-		event_sub->ev_file = ev_file;
-		/* May be needed upon cleanup the devx object/subscription */
-		event_sub->xa_key_level1 = key_level1;
 		event_sub->xa_key_level2 = obj_id;
 		INIT_LIST_HEAD(&event_sub->obj_list);
 	}
@@ -2225,10 +2240,11 @@ err:
 	list_for_each_entry_safe(event_sub, tmp_sub, &sub_list, event_list) {
 		list_del(&event_sub->event_list);
 
-		subscribe_event_xa_dealloc(devx_event_table,
-					   event_sub->xa_key_level1,
-					   obj,
-					   obj_id);
+		if (!devx_key_in_sub_list(&sub_list, event_sub->xa_key_level1))
+			subscribe_event_xa_dealloc(devx_event_table,
+						   event_sub->xa_key_level1,
+						   obj,
+						   obj_id);
 
 		if (event_sub->eventfd)
 			eventfd_ctx_put(event_sub->eventfd);