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; -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html