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authorXiaolong Huang <butterflyhuangxx@gmail.com>2021-08-20 03:50:34 +0800
committerDavid S. Miller <davem@davemloft.net>2021-08-20 14:41:03 +0100
commit7e78c597c3ebfd0cb329aa09a838734147e4f117 (patch)
tree29160f8a3394ec0b5032638368b1e005b18da42e
parenta8f89fa27773a8c96fd09fb4e2f4892d794f21f6 (diff)
net: qrtr: fix another OOB Read in qrtr_endpoint_post
This check was incomplete, did not consider size is 0: if (len != ALIGN(size, 4) + hdrlen) goto err; if size from qrtr_hdr is 0, the result of ALIGN(size, 4) will be 0, In case of len == hdrlen and size == 0 in header this check won't fail and if (cb->type == QRTR_TYPE_NEW_SERVER) { /* Remote node endpoint can bridge other distant nodes */ const struct qrtr_ctrl_pkt *pkt = data + hdrlen; qrtr_node_assign(node, le32_to_cpu(pkt->server.node)); } will also read out of bound from data, which is hdrlen allocated block. Fixes: 194ccc88297a ("net: qrtr: Support decoding incoming v2 packets") Fixes: ad9d24c9429e ("net: qrtr: fix OOB Read in qrtr_endpoint_post") Signed-off-by: Xiaolong Huang <butterflyhuangxx@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/qrtr/qrtr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index 171b7f3be6ef..0c30908628ba 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 (len != ALIGN(size, 4) + hdrlen)
+ if (!size || len != ALIGN(size, 4) + hdrlen)
goto err;
if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&