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From:   Pavel Skripkin <paskripkin@gmail.com>
To:     kraxel@redhat.com, sumit.semwal@linaro.org,
        christian.koenig@amd.com, dongwon.kim@intel.com
Cc:     linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
        linux-kernel@vger.kernel.org,
        Pavel Skripkin <paskripkin@gmail.com>,
        syzbot+e9cd3122a37c5d6c51e8@syzkaller.appspotmail.com
Subject: [PATCH next] udmabuf: fix general protection fault in udmabuf_create
Date:   Wed, 11 Aug 2021 20:50:52 +0300
Message-Id: <20210811175052.21254-1-paskripkin@gmail.com>
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Syzbot reported general protection fault in udmabuf_create. The problem
was in wrong error handling.

In commit 16c243e99d33 ("udmabuf: Add support for mapping hugepages (v4)")
shmem_read_mapping_page() call was replaced with find_get_page_flags(),
but find_get_page_flags() returns NULL on failure instead PTR_ERR().

Wrong error checking was causing GPF in get_page(), since passed page
was equal to NULL. Fix it by changing if (IS_ER(!hpage)) to if (!hpage)

Reported-by: syzbot+e9cd3122a37c5d6c51e8@syzkaller.appspotmail.com
Fixes: 16c243e99d33 ("udmabuf: Add support for mapping hugepages (v4)")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 drivers/dma-buf/udmabuf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 8df761a10251..c57a609db75b 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -227,8 +227,8 @@ static long udmabuf_create(struct miscdevice *device,
 				if (!hpage) {
 					hpage = find_get_page_flags(mapping, pgoff,
 								    FGP_ACCESSED);
-					if (IS_ERR(hpage)) {
-						ret = PTR_ERR(hpage);
+					if (!hpage) {
+						ret = -EINVAL;
 						goto err;
 					}
 				}
-- 
2.32.0