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fs: only copy to userspace on success in listmount()

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BugLink: https://bugs.launchpad.net/bugs/2085849

commit 8d42877ad65b02741c9099392a001b7209baa5d4 upstream.

Avoid copying when we failed to, or didn't have any mounts to list.

Fixes: cb54ef4f050e ("fs: don't copy to userspace under namespace semaphore") # mainline only
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Christian Brauner
2024-07-04 17:00:19 +02:00
committed by Mehmet Basaran
parent 1249174448
commit 3eda1b2df9
1 changed files with 2 additions and 0 deletions
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fs/namespace.c
+2
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@@ -5138,6 +5138,8 @@ SYSCALL_DEFINE4(listmount, const struct mnt_id_req __user *, req,
scoped_guard(rwsem_read, &namespace_sem)
ret = do_listmount(kreq.mnt_id, kreq.param, kmnt_ids, nr_mnt_ids);
if (ret <= 0)
return ret;
if (copy_to_user(mnt_ids, kmnt_ids, ret * sizeof(*mnt_ids)))
return -EFAULT;