[PATCH 05/16] backing-file: use credential guards for splice read

[Christian Brauner]

Use credential guards for scoped credential override with automatic
restoration on scope exit.

Signed-off-by: Christian Brauner <brauner at kernel.org>
---
 fs/backing-file.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/backing-file.c b/fs/backing-file.c
index 9bea737d5bef..8ebc62f49bad 100644
--- a/fs/backing-file.c
+++ b/fs/backing-file.c
@@ -283,15 +283,13 @@ ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb,
 				 unsigned int flags,
 				 struct backing_file_ctx *ctx)
 {
-	const struct cred *old_cred;
 	ssize_t ret;
 
 	if (WARN_ON_ONCE(!(in->f_mode & FMODE_BACKING)))
 		return -EIO;
 
-	old_cred = override_creds(ctx->cred);
-	ret = vfs_splice_read(in, &iocb->ki_pos, pipe, len, flags);
-	revert_creds(old_cred);
+	scoped_with_creds(ctx->cred)
+		ret = vfs_splice_read(in, &iocb->ki_pos, pipe, len, flags);
 
 	if (ctx->accessed)
 		ctx->accessed(iocb->ki_filp);

-- 
2.47.3