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esp: ensure cmdfifo is not empty and current_dev is non-NULL

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When about to execute a SCSI command, ensure that cmdfifo is not empty and
current_dev is non-NULL. This can happen if the guest tries to execute a TI
(Transfer Information) command without issuing one of the select commands
first.

Buglink: https://bugs.launchpad.net/qemu/+bug/1910723
Buglink: https://bugs.launchpad.net/qemu/+bug/1909247
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20210407195801.685-7-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-04-07 20:57:55 +01:00
parent 7b320a8e67
commit 9954575173
1 changed files with 3 additions and 0 deletions
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3
hw/scsi/esp.c
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@ -284,6 +284,9 @@ static void do_busid_cmd(ESPState *s, uint8_t busid)
trace_esp_do_busid_cmd(busid);
lun = busid & 7;
cmdlen = fifo8_num_used(&s->cmdfifo);
if (!cmdlen || !s->current_dev) {
return;
}
esp_fifo_pop_buf(&s->cmdfifo, buf, cmdlen);
current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, lun);