diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-06-30 14:46:15 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-01 04:36:13 +0300 |
| commit | 8ff41cc21714704ef0158a546c3c4d07fae2c952 (patch) | |
| tree | 455655ae7ad1e53174166f45a484c2b3812786e8 /net/qrtr | |
| parent | 6a2febec338df7e7699a52d00b2e1207dcf65b28 (diff) | |
| download | linux-8ff41cc21714704ef0158a546c3c4d07fae2c952.tar.xz | |
net: qrtr: Fix an out of bounds read qrtr_endpoint_post()
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>
Diffstat (limited to 'net/qrtr')
| -rw-r--r-- | net/qrtr/qrtr.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 059881330788..24a8c3c6da0d 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -429,7 +429,7 @@ 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); @@ -443,6 +443,8 @@ 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); @@ -456,6 +458,8 @@ 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; |