[PATCH] misc: ocxl: fix possible refcount leak in afu_ioctl()

From: Hangyu Hua
Date: Wed Aug 24 2022 - 04:27:01 EST


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")
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
---
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 6777c419a8da..d46dba2df5a1 100644
--- a/drivers/misc/ocxl/file.c
+++ b/drivers/misc/ocxl/file.c
@@ -257,6 +257,8 @@ 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:
--
2.25.1