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authorMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>2021-04-07 20:57:55 +0100
committerMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>2021-04-12 22:35:53 +0100
commit99545751734035b76bd372c4e7215bb337428d89 (patch)
treea585793c32cbb55c919cdc607eadf69fda9e6daf /hw
parent7b320a8e67a534925048cbabfa51431e0349dafd (diff)
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')
-rw-r--r--hw/scsi/esp.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index bf22785b79..904fa3179c 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);