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authorIlya Dryomov <idryomov@gmail.com>2018-07-27 19:40:30 +0200
committerIlya Dryomov <idryomov@gmail.com>2018-08-02 21:33:26 +0200
commit130f52f2b203aa0aec179341916ffb2e905f3afd (patch)
treebff0676cab201746527089611ead79b1948d1ff5 /net/ceph
parentcc255c76c70f7a87d97939621eae04b600d9f4a1 (diff)
downloadlinux-stericsson-130f52f2b203aa0aec179341916ffb2e905f3afd.tar.gz
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>
Diffstat (limited to 'net/ceph')
-rw-r--r--net/ceph/messenger.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index e915c8bce117..0a187196aeed 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -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);