From: Jeffrey Hugo <quic_jhugo@quicinc.com>
To: <mani@kernel.org>
Cc: <mhi@lists.linux.dev>, <linux-arm-msm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Jeffrey Hugo <quic_jhugo@quicinc.com>
Subject: [PATCH] bus: mhi: host: Range check CHDBOFF and ERDBOFF
Date: Fri, 17 Mar 2023 09:14:19 -0600 [thread overview]
Message-ID: <1679066059-8399-1-git-send-email-quic_jhugo@quicinc.com> (raw)
If the value read from the CHDBOFF and ERDBOFF registers is outside the
range of the MHI register space then an invalid address might be computed
which later causes a kernel panic. Range check the read value to prevent
a crash due to bad data from the device.
Fixes: 6cd330ae76ff ("bus: mhi: core: Add support for ringing channel/event ring doorbells")
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
---
drivers/bus/mhi/host/init.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index 3d779ee..ae8ebcfb 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -516,6 +516,12 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
return -EIO;
}
+ if (val >= mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB)) {
+ dev_err(dev, "CHDB offset: 0x%x is out of range: 0x%zx\n",
+ val, mhi_cntrl->reg_len - (8 * MHI_DEV_WAKE_DB));
+ return -EINVAL;
+ }
+
/* Setup wake db */
mhi_cntrl->wake_db = base + val + (8 * MHI_DEV_WAKE_DB);
mhi_cntrl->wake_set = false;
@@ -532,6 +538,12 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
return -EIO;
}
+ if (val >= mhi_cntrl->reg_len - (8 * mhi_cntrl->total_ev_rings)) {
+ dev_err(dev, "ERDB offset: 0x%x is out of range: 0x%zx\n",
+ val, mhi_cntrl->reg_len - (8 * mhi_cntrl->total_ev_rings));
+ return -EINVAL;
+ }
+
/* Setup event db address for each ev_ring */
mhi_event = mhi_cntrl->mhi_event;
for (i = 0; i < mhi_cntrl->total_ev_rings; i++, val += 8, mhi_event++) {
--
2.7.4
next reply other threads:[~2023-03-17 15:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 15:14 Jeffrey Hugo [this message]
2023-03-24 10:34 ` [PATCH] bus: mhi: host: Range check CHDBOFF and ERDBOFF Manivannan Sadhasivam
2023-03-24 13:50 ` Jeffrey Hugo
2023-03-24 14:22 ` Manivannan Sadhasivam
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