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| author | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2021-04-07 20:57:55 +0100 |
|---|---|---|
| committer | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2021-04-12 22:35:53 +0100 |
| commit | 99545751734035b76bd372c4e7215bb337428d89 (patch) | |
| tree | a585793c32cbb55c919cdc607eadf69fda9e6daf /hw/scsi/esp.c | |
| parent | 7b320a8e67a534925048cbabfa51431e0349dafd (diff) | |
| download | qemu-99545751734035b76bd372c4e7215bb337428d89.zip qemu-99545751734035b76bd372c4e7215bb337428d89.tar.gz qemu-99545751734035b76bd372c4e7215bb337428d89.tar.bz2 | |
esp: ensure cmdfifo is not empty and current_dev is non-NULL
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>
Diffstat (limited to 'hw/scsi/esp.c')
| -rw-r--r-- | hw/scsi/esp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index bf22785..904fa31 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -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); |