This is a note to let you know that I've just added the patch titled
vfs: ioctl: prevent double-fetch in dedupe ioctl
to the 4.6-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-ioctl-prevent-double-fetch-in-dedupe-ioctl.patch
and it can be found in the queue-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 10eec60ce79187686e052092e5383c99b4420a20 Mon Sep 17 00:00:00 2001
From: Scott Bauer <sbauer@xxxxxxxxxxxxxx>
Date: Wed, 27 Jul 2016 19:11:29 -0600
Subject: vfs: ioctl: prevent double-fetch in dedupe ioctl
From: Scott Bauer <sbauer@xxxxxxxxxxxxxx>
commit 10eec60ce79187686e052092e5383c99b4420a20 upstream.
This prevents a double-fetch from user space that can lead to to an
undersized allocation and heap overflow.
Fixes: 54dbc1517237 ("vfs: hoist the btrfs deduplication ioctl to the vfs")
Signed-off-by: Scott Bauer <sbauer@xxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ioctl.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -590,6 +590,7 @@ static long ioctl_file_dedupe_range(stru
goto out;
}
+ same->dest_count = count;
ret = vfs_dedupe_file_range(file, same);
if (ret)
goto out;
Patches currently in stable-queue which might be from sbauer@xxxxxxxxxxxxxx are
queue-4.6/vfs-ioctl-prevent-double-fetch-in-dedupe-ioctl.patch
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