scsi: esp: check TI buffer index before read/write
The 53C9X Fast SCSI Controller(FSC) comes with internal 16-byte FIFO buffers. One is used to handle commands and other is for information transfer. Three control variables 'ti_rptr', 'ti_wptr' and 'ti_size' are used to control r/w access to the information transfer buffer ti_buf[TI_BUFSZ=16]. In that, 'ti_rptr' is used as read index, where read occurs. 'ti_wptr' is a write index, where write would occur. 'ti_size' indicates total bytes to be read from the buffer. While reading/writing to this buffer, index could exceed its size. Add check to avoid OOB r/w access. Reported-by: NHuawei PSIRT <psirt@huawei.com> Reported-by: NLi Qiang <liqiang6-s@360.cn> Signed-off-by: NPrasad J Pandit <pjp@fedoraproject.org> Message-Id: <1465230883-22303-1-git-send-email-ppandit@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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