Hemant Kumar ee75cedf82 bus: mhi: core: Read transfer length from an event properly ... When MHI Driver receives an EOT event, it reads xfer_len from the event in the last TRE. The value is under control of the MHI device and never validated by Host MHI driver. The value should never be larger than the real size of the buffer but a malicious device can set the value 0xFFFF as maximum. This causes driver to memory overflow (both read or write). Fix this issue by reading minimum of transfer length from event and the buffer length provided. Signed-off-by: Hemant Kumar <hemantk@codeaurora.org> Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Link: https://lore.kernel.org/r/20200521170249.21795-5-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-05-22 09:35:41 +02:00
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core	bus: mhi: core: Read transfer length from an event properly	2020-05-22 09:35:41 +02:00
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