1 files changed, 3 insertions, 0 deletions

diff --git a/fs/file.c b/fs/file.c
index 0f1bda4bebfa..d3b5fa80b71b 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -922,6 +922,9 @@ SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags)
         if ((flags & ~O_CLOEXEC) != 0)
                 return -EINVAL;
 
+        if (unlikely(oldfd == newfd))
+                return -EINVAL;
+
         if (newfd >= rlimit(RLIMIT_NOFILE))
                 return -EMFILE;