net: ipc_router: Add bounds check on tx path
Add bounds check on values read from shared memory in the tx path. In cases where the VM is misbehaving, the ipcrtr fifo xport should exit and print a warning when bogus values may cause out of bounds to be read. Change-Id: I2d219b36a4d7ddb137f232f47f4fe2e662add98d Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>
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@ -129,6 +129,9 @@ static size_t fifo_tx_avail(struct msm_ipc_pipe *pipe)
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else
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avail = tail - head;
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if (WARN_ON_ONCE(avail > pipe->length))
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avail = 0;
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return avail;
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}
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@ -139,6 +142,8 @@ static void fifo_tx_write(struct msm_ipc_pipe *pipe,
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u32 head;
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head = le32_to_cpu(*pipe->head);
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if (WARN_ON_ONCE(head > pipe->length))
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return;
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len = min_t(size_t, count, pipe->length - head);
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if (len)
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