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net: qrtr: Fix an out of bounds read qrtr_endpoint_post()

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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: 194ccc8829 ("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>
This commit is contained in:
Dan Carpenter 2020-06-30 14:46:15 +03:00 • committed by Greg Kroah-Hartman
commit 91f8d05b4b
1 changed files with 5 additions and 1 deletions
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6
net/qrtr/qrtr.c
View file

@ -259,7 +259,7 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
unsigned int ver;
size_t hdrlen;
if (len & 3)
if (len == 0 || len & 3)
return -EINVAL;
skb = netdev_alloc_skb(NULL, len);
@ -273,6 +273,8 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
switch (ver) {
case QRTR_PROTO_VER_1:
if (len < sizeof(*v1))
goto err;
v1 = data;
hdrlen = sizeof(*v1);
@ -286,6 +288,8 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
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;