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authorDan Carpenter <dan.carpenter@oracle.com>2021-08-30 11:37:17 +0300
committerDavid S. Miller <davem@davemloft.net>2021-08-30 12:26:57 +0100
commitaaa8e4922c887ff47ad66ef918193682bccc1905 (patch)
treebdedc982e850092ab7fced04a915278f406fb49e /net/qrtr
parentefe487fce3061d94222c6501d7be3aa549b3dc78 (diff)
downloadlinux-aaa8e4922c887ff47ad66ef918193682bccc1905.tar.bz2
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>
Diffstat (limited to 'net/qrtr')
-rw-r--r--net/qrtr/qrtr.c8
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));
}