| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 053/146] net: qrtr: fix OOB Read in qrtr_endpoint_post | Date | Mon, 21 Jun 2021 18:14:43 +0200 |
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From: Pavel Skripkin <paskripkin@gmail.com>
[ Upstream commit ad9d24c9429e2159d1e279dc3a83191ccb4daf1d ]
Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type:
if (len != ALIGN(size, 4) + hdrlen) goto err;
If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and
skb_put_data(skb, data + hdrlen, size);
will read out of bound from data, which is hdrlen allocated block.
Fixes: 194ccc88297a ("net: qrtr: Support decoding incoming v2 packets") Reported-and-tested-by: syzbot+1917d778024161609247@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/qrtr/qrtr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 93a7edcff11e..0d9baddb9cd4 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) struct qrtr_sock *ipc; struct sk_buff *skb; struct qrtr_cb *cb; - unsigned int size; + size_t size; unsigned int ver; size_t hdrlen; -- 2.30.2
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