[PATCH v7 6/9] pidfd: Replace open-coded receive_fd()

[Kees Cook <keescook@xxxxxxxxxxxx>]

Replace the open-coded version of receive_fd() with a call to the
new helper.

Thanks to Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@xxxxxxxxx> for
catching a missed fput() in an earlier version of this patch.

Reviewed-by: Sargun Dhillon <sargun@xxxxxxxxx>
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 kernel/pid.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 85ed00abdc7c..da5aea5f04fa 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -636,19 +636,8 @@ static int pidfd_getfd(struct pid *pid, int fd)
 	if (IS_ERR(file))
 		return PTR_ERR(file);
 
-	ret = security_file_receive(file);
-	if (ret) {
-		fput(file);
-		return ret;
-	}
-
-	ret = get_unused_fd_flags(O_CLOEXEC);
-	if (ret < 0) {
-		fput(file);
-	} else {
-		fd_install(ret, file);
-		__receive_sock(file);
-	}
+	ret = receive_fd(file, O_CLOEXEC);
+	fput(file);
 
 	return ret;
 }
-- 
2.25.1