On Mon, 27 Oct 2014, Ilya Dryomov wrote:
> Commit c27a3e4d667f ("libceph: do not hard code max auth ticket len")
> while fixing a buffer overlow tried to keep the same as much of the
> surrounding code as possible and introduced an unnecessary kmalloc() in
> the unencrypted ticket path. It is likely to fail on huge tickets, so
> get rid of it.
>
> Signed-off-by: Ilya Dryomov <[email protected]>
Reviewed-by: Sage Weil <[email protected]>
> ---
> net/ceph/auth_x.c | 25 ++++++++++---------------
> 1 file changed, 10 insertions(+), 15 deletions(-)
>
> diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c
> index de6662b14e1f..7e38b729696a 100644
> --- a/net/ceph/auth_x.c
> +++ b/net/ceph/auth_x.c
> @@ -149,6 +149,7 @@ static int process_one_ticket(struct ceph_auth_client *ac,
> struct ceph_crypto_key old_key;
> void *ticket_buf = NULL;
> void *tp, *tpend;
> + void **ptp;
> struct ceph_timespec new_validity;
> struct ceph_crypto_key new_session_key;
> struct ceph_buffer *new_ticket_blob;
> @@ -208,25 +209,19 @@ static int process_one_ticket(struct ceph_auth_client
> *ac,
> goto out;
> }
> tp = ticket_buf;
> - dlen = ceph_decode_32(&tp);
> + ptp = &tp;
> + tpend = *ptp + dlen;
> } else {
> /* unencrypted */
> - ceph_decode_32_safe(p, end, dlen, bad);
> - ticket_buf = kmalloc(dlen, GFP_NOFS);
> - if (!ticket_buf) {
> - ret = -ENOMEM;
> - goto out;
> - }
> - tp = ticket_buf;
> - ceph_decode_need(p, end, dlen, bad);
> - ceph_decode_copy(p, ticket_buf, dlen);
> + ptp = p;
> + tpend = end;
> }
> - tpend = tp + dlen;
> + ceph_decode_32_safe(ptp, tpend, dlen, bad);
> dout(" ticket blob is %d bytes\n", dlen);
> - ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
> - blob_struct_v = ceph_decode_8(&tp);
> - new_secret_id = ceph_decode_64(&tp);
> - ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
> + ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
> + blob_struct_v = ceph_decode_8(ptp);
> + new_secret_id = ceph_decode_64(ptp);
> + ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
> if (ret)
> goto out;
>
> --
> 1.7.10.4
>
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