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bus: mhi: host: Range check CHDBOFF and ERDBOFF

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commit 6a0c637bfe upstream.

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: 6cd330ae76 ("bus: mhi: core: Add support for ringing channel/event ring doorbells")
Cc: stable@vger.kernel.org
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://lore.kernel.org/r/1679674384-27209-1-git-send-email-quic_jhugo@quicinc.com
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeffrey Hugo
2023-03-24 10:13:04 -06:00
committed by Greg Kroah-Hartman
parent 4afe300afb
commit a2cbb1a45a
1 changed files with 12 additions and 0 deletions
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12
drivers/bus/mhi/host/init.c
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@@ -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 -ERANGE;
}
/* 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 -ERANGE;
}
/* 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++) {