diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2021-08-30 11:37:17 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-08-30 12:26:57 +0100 |
| commit | aaa8e4922c887ff47ad66ef918193682bccc1905 (patch) | |
| tree | bdedc982e850092ab7fced04a915278f406fb49e | |
| parent | efe487fce3061d94222c6501d7be3aa549b3dc78 (diff) | |
| download | linux-aaa8e4922c887ff47ad66ef918193682bccc1905.tar.gz | |
net: qrtr: make checks in qrtr_endpoint_post() stricter
These checks are still not strict enough. The main problem is that if
"cb->type == QRTR_TYPE_NEW_SERVER" is true then "len - hdrlen" is
guaranteed to be 4 but we need to be at least 16 bytes. In fact, we
can reject everything smaller than sizeof(*pkt) which is 20 bytes.
Also I don't like the ALIGN(size, 4). It's better to just insist that
data is needs to be aligned at the start.
Fixes: 0baa99ee353c ("net: qrtr: Allow non-immediate node routing")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/qrtr/qrtr.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index b8508e35d20e..525e3ea063b1 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -493,7 +493,7 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) goto err; } - if (!size || len != ALIGN(size, 4) + hdrlen) + if (!size || size & 3 || len != size + hdrlen) goto err; if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && @@ -506,8 +506,12 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) if (cb->type == QRTR_TYPE_NEW_SERVER) { /* Remote node endpoint can bridge other distant nodes */ - const struct qrtr_ctrl_pkt *pkt = data + hdrlen; + const struct qrtr_ctrl_pkt *pkt; + if (size < sizeof(*pkt)) + goto err; + + pkt = data + hdrlen; qrtr_node_assign(node, le32_to_cpu(pkt->server.node)); } |