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[PULL,11/18] hw/usb/hcd-dwc2: Handle invalid address access in read and write functions

Message ID 20240622120643.3797539-12-peter.maydell@linaro.org
State Not Applicable
Headers show
Series [PULL,01/18] hw/net/can/xlnx-versal-canfd: Fix sorting of the tx queue | expand

Commit Message

Peter Maydell June 22, 2024, 12:06 p.m. UTC 
From: Zheyu Ma <zheyuma97@gmail.com>

This commit modifies the dwc2_hsotg_read() and dwc2_hsotg_write() functions
to handle invalid address access gracefully. Instead of using
g_assert_not_reached(), which causes the program to abort, the functions
now log an error message and return a default value for reads or do
nothing for writes.

This change prevents the program from aborting and provides clear log
messages indicating when an invalid memory address is accessed.

Reproducer:
cat << EOF | qemu-system-aarch64 -display none \
-machine accel=qtest, -m 512M -machine raspi2b -m 1G -nodefaults \
-usb -drive file=null-co://,if=none,format=raw,id=disk0 -device \
usb-storage,port=1,drive=disk0 -qtest stdio
readl 0x3f980dfb
EOF

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Reviewed-by: Paul Zimmerman <pauldzim@gmail.com>
Message-id: 20240618135610.3109175-1-zheyuma97@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/usb/hcd-dwc2.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/hw/usb/hcd-dwc2.c b/hw/usb/hcd-dwc2.c
index 8cac9c0a062..b4f0652c7d2 100644
--- a/hw/usb/hcd-dwc2.c
+++ b/hw/usb/hcd-dwc2.c
@@ -1128,7 +1128,10 @@  static uint64_t dwc2_hsotg_read(void *ptr, hwaddr addr, unsigned size)
         val = dwc2_pcgreg_read(ptr, addr, (addr - HSOTG_REG(0xe00)) >> 2, size);
         break;
     default:
-        g_assert_not_reached();
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"HWADDR_PRIx"\n",
+                      __func__, addr);
+        val = 0;
+        break;
     }
 
     return val;
@@ -1160,7 +1163,9 @@  static void dwc2_hsotg_write(void *ptr, hwaddr addr, uint64_t val,
         dwc2_pcgreg_write(ptr, addr, (addr - HSOTG_REG(0xe00)) >> 2, val, size);
         break;
     default:
-        g_assert_not_reached();
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"HWADDR_PRIx"\n",
+                      __func__, addr);
+        break;
     }
 }