linux-kernel - [PATCH 4.19 049/229] Revert "fs: check FMODE_LSEEK to control internal pipe splicing"

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Message-Id: <20221024113000.669471664@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:29:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 049/229] Revert "fs: check FMODE_LSEEK to control internal pipe splicing"

This reverts commit fd0a6e99b61e6c08fa5cf585d54fd956f70c73a6.

Which was upstream commit 97ef77c52b789ec1411d360ed99dca1efe4b2c81.

The commit is missing dependencies and breaks NFS tests, remove it for
now.

Reported-by: Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/splice.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/fs/splice.c
+++ b/fs/splice.c
@@ -899,15 +899,17 @@ ssize_t splice_direct_to_actor(struct fi
 {
 	struct pipe_inode_info *pipe;
 	long ret, bytes;
+	umode_t i_mode;
 	size_t len;
 	int i, flags, more;
 
 	/*
-	 * We require the input to be seekable, as we don't want to randomly
-	 * drop data for eg socket -> socket splicing. Use the piped splicing
-	 * for that!
+	 * We require the input being a regular file, as we don't want to
+	 * randomly drop data for eg socket -> socket splicing. Use the
+	 * piped splicing for that!
 	 */
-	if (unlikely(!(in->f_mode & FMODE_LSEEK)))
+	i_mode = file_inode(in)->i_mode;
+	if (unlikely(!S_ISREG(i_mode) && !S_ISBLK(i_mode)))
 		return -EINVAL;
 
 	/*