linux-kernel - [PATCH 09/10] udmabuf: use EBADFD in case we didn't got a memfd

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Date:   Tue, 11 Sep 2018 08:59:20 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     laurent.pinchart@...asonboard.com,
        Gerd Hoffmann <kraxel@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-media@...r.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK),
        linaro-mm-sig@...ts.linaro.org (moderated list:DMA BUFFER SHARING
        FRAMEWORK), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 09/10] udmabuf: use EBADFD in case we didn't got a memfd

Reported-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/dma-buf/udmabuf.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index ec46513a47..1862bb6bed 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -154,14 +154,17 @@ static long udmabuf_create(struct const udmabuf_create_list *head,
 
 	pgbuf = 0;
 	for (i = 0; i < head->count; i++) {
+		ret = -EBADFD;
 		memfd = fget(list[i].memfd);
 		if (!memfd)
 			goto err;
 		if (!shmem_mapping(file_inode(memfd)->i_mapping))
 			goto err;
 		seals = memfd_fcntl(memfd, F_GET_SEALS, 0);
-		if (seals == -EINVAL ||
-		    (seals & SEALS_WANTED) != SEALS_WANTED ||
+		if (seals == -EINVAL)
+			goto err;
+		ret = -EINVAL;
+		if ((seals & SEALS_WANTED) != SEALS_WANTED ||
 		    (seals & SEALS_DENIED) != 0)
 			goto err;
 		pgoff = list[i].offset >> PAGE_SHIFT;
-- 
2.9.3