From: Prasad J Pandit Date: Tue, 31 May 2016 23:23:27 +0530 Subject: [PATCH] scsi: esp: check buffer length before reading scsi command 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 Signed-off-by: Prasad J Pandit Message-Id: <1464717207-7549-1-git-send-email-ppandit@redhat.com> Signed-off-by: Paolo Bonzini (cherry picked from commit d3cdc49138c30be1d3c2f83d18f85d9fdee95f1a) --- hw/scsi/esp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 591c817..c2f6f8f 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; }