Patch "vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets" has been added to the 3.18-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vfs-return-enxio-for-negative-seek_hole-seek_data-offsets.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fc46820b27a2d9a46f7e90c9ceb4a64a1bc5fab8 Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Mon, 25 Sep 2017 12:23:03 +0200
Subject: vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets

From: Andreas Gruenbacher <agruenba@redhat.com>

commit fc46820b27a2d9a46f7e90c9ceb4a64a1bc5fab8 upstream.

In generic_file_llseek_size, return -ENXIO for negative offsets as well
as offsets beyond EOF.  This affects filesystems which don't implement
SEEK_HOLE / SEEK_DATA internally, possibly because they don't support
holes.

Fixes xfstest generic/448.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/read_write.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -116,7 +116,7 @@ generic_file_llseek_size(struct file *fi
 		 * In the generic case the entire file is data, so as long as
 		 * offset isn't at the end of the file then the offset is data.
 		 */
-		if (offset >= eof)
+		if ((unsigned long long)offset >= eof)
 			return -ENXIO;
 		break;
 	case SEEK_HOLE:
@@ -124,7 +124,7 @@ generic_file_llseek_size(struct file *fi
 		 * There is a virtual hole at the end of the file, so as long as
 		 * offset isn't i_size or larger, return i_size.
 		 */
-		if (offset >= eof)
+		if ((unsigned long long)offset >= eof)
 			return -ENXIO;
 		offset = eof;
 		break;


Patches currently in stable-queue which might be from agruenba@redhat.com are

queue-3.18/vfs-return-enxio-for-negative-seek_hole-seek_data-offsets.patch