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libceph: check authorizer reply/challenge length before reading 

Avoid scribbling over memory if the received reply/challenge is larger
than the buffer supplied with the authorizer.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Ilya Dryomov 2018-07-27 19:40:30 +02:00
parent cc255c76c7
commit 130f52f2b2
1 changed files with 7 additions and 0 deletions
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7
net/ceph/messenger.c
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@ -1782,6 +1782,13 @@ static int read_partial_connect(struct ceph_connection *con)
if (con->auth) {
size = le32_to_cpu(con->in_reply.authorizer_len);
if (size > con->auth->authorizer_reply_buf_len) {
pr_err("authorizer reply too big: %d > %zu\n", size,
con->auth->authorizer_reply_buf_len);
ret = -EINVAL;
goto out;
}
end += size;
ret = read_partial(con, end, size,
con->auth->authorizer_reply_buf);