4.6-stable review patch. If anyone has any objections, please let me know.
------------------
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;
--
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