From: Miklos Szeredi mszeredi@redhat.com
stable inclusion from linux-4.19.198 commit e7779b7470ef229b895c45e19d299cfa4902157b
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commit 49221cf86d18bb66fe95d3338cb33bd4b9880ca5 upstream.
Don't allow userspace to report errors that could be kernel-internal.
Reported-by: Anatoly Trosinenko anatoly.trosinenko@gmail.com Fixes: 334f485df85a ("[PATCH] FUSE - device functions") Cc: stable@vger.kernel.org # v2.6.14 Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- fs/fuse/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 498a4fab40801..8b22f8705dd48 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -1896,7 +1896,7 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud, }
err = -EINVAL; - if (oh.error <= -1000 || oh.error > 0) + if (oh.error <= -512 || oh.error > 0) goto err_finish;
spin_lock(&fpq->lock);