diff options
| author | Prasad J Pandit <pjp@fedoraproject.org> | 2016-05-19 16:09:30 +0530 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-05-23 16:53:45 +0200 |
| commit | c98c6c105f66f05aa0b7c1d2a4a3f716450907ef (patch) | |
| tree | abe4f75408dc950a553ca8e122198666cd7a7553 /hw | |
| parent | fd28938b7adb33f8af11849cdd0d0b2fb92990e3 (diff) | |
esp: check command buffer length before write(CVE-2016-4439)
The 53C9X Fast SCSI Controller(FSC) comes with an internal 16-byte
FIFO buffer. It is used to handle command and data transfer. While
writing to this command buffer 's->cmdbuf[TI_BUFSZ=16]', a check
was missing to validate input length. Add check to avoid OOB write
access.
Fixes CVE-2016-4439.
Reported-by: Li Qiang <liqiang6-s@360.cn>
Cc: qemu-stable@nongnu.org
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <1463654371-11169-2-git-send-email-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/scsi/esp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 8961be2f34..01497e6740 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -448,7 +448,11 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val) break; case ESP_FIFO: if (s->do_cmd) { - s->cmdbuf[s->cmdlen++] = val & 0xff; + if (s->cmdlen < TI_BUFSZ) { + s->cmdbuf[s->cmdlen++] = val & 0xff; + } else { + trace_esp_error_fifo_overrun(); + } } else if (s->ti_size == TI_BUFSZ - 1) { trace_esp_error_fifo_overrun(); } else { |