[PATCH] hw/scsi/esp: fix assertion error in fifo8_push

[Zheng Huang <hz1624917200@gmail.com>]

This patch add validation checks on FIFO structures in esp_post_load() to
avoid assertion error `assert(fifo->num < fifo->capacity);` in fifo8_push(),
which can occur if the inbound migration stream is malformed. By performing 
these checks during post-load, we can catch and handle such issues earlier, 
avoiding crashes due to corrupted state.

Signed-off-by: Zheng Huang <hz1624917200@gmail.com>
---
 hw/scsi/esp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index ac841dc32e..ba77017087 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -1350,11 +1350,17 @@ static int esp_post_load(void *opaque, int version_id)
         /* Migrate ti_buf to fifo */
         len = s->mig_ti_wptr - s->mig_ti_rptr;
         for (i = 0; i < len; i++) {
+            if (&s->fifo.num >= &s->fifo.capacity) {
+                return -1;
+            }
             fifo8_push(&s->fifo, s->mig_ti_buf[i]);
         }
 
         /* Migrate cmdbuf to cmdfifo */
         for (i = 0; i < s->mig_cmdlen; i++) {
+            if (&s->cmdfifo.num >= &s->cmdfifo.capacity) {
+                return -1;
+            }
             fifo8_push(&s->cmdfifo, s->mig_cmdbuf[i]);
         }
     }
-- 
2.34.1