The buffer passed to btrfs_ioctl_tree_search* functions have to be at least sizeof(struct btrfs_ioctl_search_header). If this is not the case then the ioctl should return -EOVERFLOW and set the uarg->buf_size to the minimum required size. Currently btrfs_ioctl_tree_search_v2 would return an -EOVERFLOW error with ->buf_size being set to the value passed by user space. Fix this by removing the size check and relying on search_ioctl, which already includes it and correctly sets buf_size. Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx> --- fs/btrfs/ioctl.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index fa1b78cf25f6..e80950b3f340 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2201,9 +2201,6 @@ static noinline int btrfs_ioctl_tree_search_v2(struct file *file, buf_size = args.buf_size; - if (buf_size < sizeof(struct btrfs_ioctl_search_header)) - return -EOVERFLOW; - /* limit result size to 16MB */ if (buf_size > buf_limit) buf_size = buf_limit; -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
