author: Matthew Wilcox (Oracle) <willy@infradead.org> 2021-10-25 19:16:34 +0100
committer: Linus Torvalds <torvalds@linux-foundation.org> 2021-10-25 11:27:31 -0700
commit: cb685432398122053f3e1dc6a1d68924e5b77be4
parent: ac8a6eba2a117e0fdc04da62ab568d1b7ca4c8f6
Commit Summary:
Diffstat:
1 file changed, 2 insertions, 0 deletions
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 030f02ddc7c1..c2dda408bb36 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -203,6 +203,8 @@ SYSCALL_DEFINE1(memfd_secret, unsigned int, flags)
if (flags & ~(SECRETMEM_FLAGS_MASK | O_CLOEXEC))
return -EINVAL;
+ if (atomic_read(&secretmem_users) < 0)
+ return -ENFILE;
fd = get_unused_fd_flags(flags & O_CLOEXEC);
if (fd < 0)