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| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-08-11 20:50:52 +0300 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-08-12 10:27:22 +0300 |
| commit | b9770b0b6eac2be3772b6f4748e6b899a9ab2870 (patch) | |
| tree | 37c0c51100ab841911453d60f4531a75b96c150f /drivers/dma-buf/udmabuf.c | |
| parent | 83326a73a1f2933295d30667ab4996b1b1099708 (diff) | |
| download | linux-b9770b0b6eac2be3772b6f4748e6b899a9ab2870.tar.xz | |
udmabuf: fix general protection fault in udmabuf_create
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>
Link: http://patchwork.freedesktop.org/patch/msgid/20210811175052.21254-1-paskripkin@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'drivers/dma-buf/udmabuf.c')
| -rw-r--r-- | drivers/dma-buf/udmabuf.c | 4 |
1 files 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; } } |