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esp: ensure that do_cmd is set to zero before submitting an ESP select command 

When a CDB has been received and is about to be submitted to the SCSI layer
via one of the ESP select commands, ensure that do_cmd is set to zero before
executing the command.

Otherwise a guest executing 2 valid CDBs in quick sequence can invoke the SCSI
.transfer_data callback again before do_cmd is set to zero by the callback
function triggering an assert at the start of esp_transfer_data().

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210407195801.685-12-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-04-07 20:58:00 +01:00
parent 324c880989
commit 607206948c
1 changed files with 2 additions and 0 deletions
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2
hw/scsi/esp.c
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@ -357,6 +357,7 @@ static void handle_satn(ESPState *s)
cmdlen = get_cmd(s, ESP_CMDFIFO_SZ);
if (cmdlen > 0) {
s->cmdfifo_cdb_offset = 1;
s->do_cmd = 0;
do_cmd(s);
} else if (cmdlen == 0) {
s->do_cmd = 1;
@ -390,6 +391,7 @@ static void handle_s_without_atn(ESPState *s)
cmdlen = get_cmd(s, ESP_CMDFIFO_SZ);
if (cmdlen > 0) {
s->cmdfifo_cdb_offset = 0;
s->do_cmd = 0;
do_busid_cmd(s, 0);
} else if (cmdlen == 0) {
s->do_cmd = 1;