[PATCH 5.4 136/255] misc: ocxl: fix possible refcount leak in afu_ioctl()

[Greg Kroah-Hartman]

From: Hangyu Hua <hbh25y@xxxxxxxxx>

[ Upstream commit c3b69ba5114c860d730870c03ab4ee45276e5e35 ]

eventfd_ctx_put need to be called to put the refcount that gotten by
eventfd_ctx_fdget when ocxl_irq_set_handler fails.

Fixes: 060146614643 ("ocxl: move event_fd handling to frontend")
Acked-by: Frederic Barrat <fbarrat@xxxxxxxxxxxxx>
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220824082600.36159-1-hbh25y@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/misc/ocxl/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
index c742ab02ae18..e094809b54ff 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c
@@ -259,6 +259,8 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
 		if (IS_ERR(ev_ctx))
 			return PTR_ERR(ev_ctx);
 		rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
+		if (rc)
+			eventfd_ctx_put(ev_ctx);
 		break;
 
 	case OCXL_IOCTL_GET_METADATA:
-- 
2.35.1