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esp: check for NULL result from scsi_device_find()

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Add a 'current_lun' check for a null value
to avoid null pointer dereferencing and
recover host if NULL return

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 4eb8606560 (esp: store lun coming from the MESSAGE OUT phase)
Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
Message-ID: <20231229152647.19699-1-adiupina@astralinux.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexandra Diupina 2023-12-29 18:26:47 +03:00 committed by Paolo Bonzini
parent 2196157404
commit b22f83d8df
1 changed files with 9 additions and 0 deletions
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9
hw/scsi/esp.c
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@ -292,6 +292,15 @@ static void do_command_phase(ESPState *s)
esp_fifo_pop_buf(&s->cmdfifo, buf, cmdlen);
current_lun = scsi_device_find(&s->bus, 0, s->current_dev->id, s->lun);
if (!current_lun) {
/* No such drive */
s->rregs[ESP_RSTAT] = 0;
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = SEQ_0;
esp_raise_irq(s);
return;
}
s->current_req = scsi_req_new(current_lun, 0, s->lun, buf, cmdlen, s);
datalen = scsi_req_enqueue(s->current_req);
s->ti_size = datalen;