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Btrfs: limit the path size in send to PATH_MAX

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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>
This commit is contained in:
Chris Mason 2014-04-26 05:02:03 -07:00
parent f8213bdc89
commit cfd4a535b6
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/send.c
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@ -349,6 +349,11 @@ static int fs_path_ensure_buf(struct fs_path *p, int len)
if (p->buf_len >= len) if (p->buf_len >= len)
return 0; return 0;
if (len > PATH_MAX) {
WARN_ON(1);
return -ENOMEM;
}
path_len = p->end - p->start; path_len = p->end - p->start;
old_buf_len = p->buf_len; old_buf_len = p->buf_len;