From: Prasad J Pandit <p...@fedoraproject.org> The 53C9X Fast SCSI Controller(FSC) comes with an internal 16-byte FIFO buffer. It is used to handle command and data transfer. Routine get_cmd() in non-DMA mode, uses 'ti_size' to read scsi command into a buffer. Add check to validate command length against buffer size to avoid any overrun.
Reported-by: Li Qiang <liqiang...@360.cn> Signed-off-by: Prasad J Pandit <p...@fedoraproject.org> --- hw/scsi/esp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 60c1b28..953027a 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -98,6 +98,9 @@ static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen) s->dma_memory_read(s->dma_opaque, buf, dmalen); } else { dmalen = s->ti_size; + if (dmalen > TI_BUFSZ) { + return 0; + } memcpy(buf, s->ti_buf, dmalen); buf[0] = buf[2] >> 5; } -- 2.5.5