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-rw-r--r--fs/file.c3
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;