linux-kernel - [PATCH] misc: ocxl: fix possible refcount leak in afu

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Message-Id: <20220824082600.36159-1-hbh25y@gmail.com>
Date:   Wed, 24 Aug 2022 16:26:00 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     fbarrat@...ux.ibm.com, ajd@...ux.ibm.com, arnd@...db.de,
        gregkh@...uxfoundation.org, alastair@...ilva.org,
        mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] misc: ocxl: fix possible refcount leak in afu_ioctl()

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@...il.com>
---
 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