--- /dev/null
+From 8ff41cc21714704ef0158a546c3c4d07fae2c952 Mon Sep 17 00:00:00 2001
+From: Dan Carpenter <dan.carpenter@oracle.com>
+Date: Tue, 30 Jun 2020 14:46:15 +0300
+Subject: net: qrtr: Fix an out of bounds read qrtr_endpoint_post()
+
+From: Dan Carpenter <dan.carpenter@oracle.com>
+
+commit 8ff41cc21714704ef0158a546c3c4d07fae2c952 upstream.
+
+This code assumes that the user passed in enough data for a
+qrtr_hdr_v1 or qrtr_hdr_v2 struct, but it's not necessarily true. If
+the buffer is too small then it will read beyond the end.
+
+Reported-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+Reported-by: syzbot+b8fe393f999a291a9ea6@syzkaller.appspotmail.com
+Fixes: 194ccc88297a ("net: qrtr: Support decoding incoming v2 packets")
+Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ net/qrtr/qrtr.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/net/qrtr/qrtr.c
++++ b/net/qrtr/qrtr.c
+@@ -266,7 +266,7 @@ int qrtr_endpoint_post(struct qrtr_endpo
+ unsigned int ver;
+ size_t hdrlen;
+
+- if (len & 3)
++ if (len == 0 || len & 3)
+ return -EINVAL;
+
+ skb = netdev_alloc_skb(NULL, len);
+@@ -280,6 +280,8 @@ int qrtr_endpoint_post(struct qrtr_endpo
+
+ switch (ver) {
+ case QRTR_PROTO_VER_1:
++ if (len < sizeof(*v1))
++ goto err;
+ v1 = data;
+ hdrlen = sizeof(*v1);
+
+@@ -293,6 +295,8 @@ int qrtr_endpoint_post(struct qrtr_endpo
+ size = le32_to_cpu(v1->size);
+ break;
+ case QRTR_PROTO_VER_2:
++ if (len < sizeof(*v2))
++ goto err;
+ v2 = data;
+ hdrlen = sizeof(*v2) + v2->optlen;
+