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

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

Fixes: cb54ef4f05 ("fs: don't copy to userspace under namespace semaphore") # mainline only
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2024-07-04 17:00:19 +02:00
parent 682d12148c
commit 8d42877ad6
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1 changed files with 2 additions and 0 deletions
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fs/namespace.c
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@ -5401,6 +5401,8 @@ SYSCALL_DEFINE4(listmount, const struct mnt_id_req __user *, req,
scoped_guard(rwsem_read, &namespace_sem)
ret = do_listmount(ns, kreq.mnt_id, kreq.param, kmnt_ids,
nr_mnt_ids, (flags & LISTMOUNT_REVERSE));
if (ret <= 0)
return ret;
if (copy_to_user(mnt_ids, kmnt_ids, ret * sizeof(*mnt_ids)))
return -EFAULT;