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From:   Jeff Layton <jlayton@kernel.org>
To:     linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org
Cc:     akpm@linux-foundation.org, idryomov@gmail.com, zyan@redhat.com,
        sage@redhat.com, agruenba@redhat.com
Subject: [PATCH 3/3] ceph: return -ERANGE if virtual xattr value didn't fit in buffer
Date:   Fri, 14 Jun 2019 09:46:25 -0400
Message-Id: <20190614134625.6870-4-jlayton@kernel.org>
In-Reply-To: <20190614134625.6870-1-jlayton@kernel.org>
References: <20190614134625.6870-1-jlayton@kernel.org>
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The getxattr manpage states that we should return ERANGE if the
destination buffer size is too small to hold the value.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/xattr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index a1cd9613be98..e3246c27f2da 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -805,8 +805,11 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
 		if (err)
 			return err;
 		err = -ENODATA;
-		if (!(vxattr->exists_cb && !vxattr->exists_cb(ci)))
+		if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
 			err = vxattr->getxattr_cb(ci, value, size);
+			if (size && size < err)
+				err = -ERANGE;
+		}
 		return err;
 	}
 
-- 
2.21.0