net/wan/fsl_ucc_hdlc: reject muram offsets above 64K
[ Upstream commit 148587a59f
]
Qiang Zhao points out that these offsets get written to 16-bit
registers, and there are some QE platforms with more than 64K
muram. So it is possible that qe_muram_alloc() gives us an allocation
that can't actually be used by the hardware, so detect and reject
that.
Reported-by: Qiang Zhao <qiang.zhao@nxp.com>
Reviewed-by: Timur Tabi <timur@kernel.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -245,6 +245,11 @@ static int uhdlc_init(struct ucc_hdlc_private *priv)
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ret = -ENOMEM;
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goto free_riptr;
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}
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if (riptr != (u16)riptr || tiptr != (u16)tiptr) {
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dev_err(priv->dev, "MURAM allocation out of addressable range\n");
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ret = -ENOMEM;
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goto free_tiptr;
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}
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/* Set RIPTR, TIPTR */
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iowrite16be(riptr, &priv->ucc_pram->riptr);
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