net: qrtr: fix OOB Read in qrtr_endpoint_post
[ Upstream commit ad9d24c9 ] 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: 194ccc88 ("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>
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