From: Yanfei Xu <yanfei.xu@xxxxxxxxxxxxx>
when get_unused_fd_flags gets failure, userfaultfd_ctx_cachep will
be freed by userfaultfd_fops's release function which is the
userfaultfd_release. So we could return directly after fput().
userfaultfd_release()->userfaultfd_ctx_put(ctx)
Fixes: d08ac70b1e0d (Wire UFFD up to SELinux)
Reported-by: syzbot+75867c44841cb6373570@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Yanfei Xu <yanfei.xu@xxxxxxxxxxxxx>
---
fs/userfaultfd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 3a4d6ac5a81a..e98317c15530 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -2049,7 +2049,7 @@ SYSCALL_DEFINE1(userfaultfd, int, flags)
fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
if (fd < 0) {
fput(file);
- goto out;
+ return fd;
}
ctx->owner = file_inode(file);
--
2.18.2
