Commit cfd4a535 authored Apr 26, 2014 by Chris Mason

Btrfs: limit the path size in send to PATH_MAX



fs_path_ensure_buf is used to make sure our path buffers for
send are big enough for the path names as we construct them.
The buffer size is limited to 32K by the length field in
the struct.

But bugs in the path construction can end up trying to build
a huge buffer, and we'll do invalid memmmoves when the
buffer length field wraps.

This patch is step one, preventing the overflows.

Signed-off-by: Chris Mason <clm@fb.com>

parent f8213bdc

fs/btrfs/send.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -349,6 +349,11 @@ static int fs_path_ensure_buf(struct fs_path *p, int len)
		if (p->buf_len >= len)
		return 0;

		if (len > PATH_MAX) {
		WARN_ON(1);
		return -ENOMEM;
		}

		path_len = p->end - p->start;
		old_buf_len = p->buf_len;

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