RDMA/ucma: check fd type in ucma_migrate_id()

BugLink: https://bugs.launchpad.net/bugs/1836426
[ Upstream commit 0d23ba6034b9cf48b8918404367506da3e4b3ee5 ]

The current code grabs the private_data of whatever file descriptor
userspace has supplied and implicitly casts it to a `struct ucma_file *`,
potentially causing a type confusion.

This is probably fine in practice because the pointer is only used for
comparisons, it is never actually dereferenced; and even in the
comparisons, it is unlikely that a file from another filesystem would have
a ->private_data pointer that happens to also be valid in this context.
But ->private_data is not always guaranteed to be a valid pointer to an
object owned by the file's filesystem; for example, some filesystems just
cram numbers in there.

Check the type of the supplied file descriptor to be safe, analogous to how
other places in the kernel do it.

Fixes: 88314e4dda1e ("RDMA/cma: add support for rdma_migrate_id()")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 66389f20d4e824ded76d9525fe0e65c915bdf66c..69d35a642504d32ac56abcc8ecdc8c4abfdd9a2a 100644 (file)
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -126,6 +126,8 @@ static DEFINE_MUTEX(mut);
 static DEFINE_IDR(ctx_idr);
 static DEFINE_IDR(multicast_idr);
 
+static const struct file_operations ucma_fops;
+
 static inline struct ucma_context *_ucma_find_context(int id,
                                                      struct ucma_file *file)
 {
@@ -1566,6 +1568,10 @@ static ssize_t ucma_migrate_id(struct ucma_file *new_file,
        f = fdget(cmd.fd);
        if (!f.file)
                return -ENOENT;
+       if (f.file->f_op != &ucma_fops) {
+               ret = -EINVAL;
+               goto file_put;
+       }
 
        /* Validate current fd and prevent destruction of id. */
        ctx = ucma_get_ctx(f.file->private_data, cmd.id);