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* [PATCH] hw/usb/imx: Fix out of bounds access in imx_usbphy_read()
@ 2023-03-16 23:49 Guenter Roeck
  2023-03-17  9:52 ` Qiang Liu
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Guenter Roeck @ 2023-03-16 23:49 UTC (permalink / raw)
  To: Peter Maydell
  Cc: Gerd Hoffmann, Jean-Christophe Dubois, qemu-arm, qemu-devel,
	Guenter Roeck, Qiang Liu

The i.MX USB Phy driver does not check register ranges, resulting in out of
bounds accesses if an attempt is made to access non-existing PHY registers.
Add range check and conditionally report bad accesses to fix the problem.

While at it, also conditionally log attempted writes to non-existing or
read-only registers.

Reported-by: Qiang Liu <cyruscyliu@gmail.com>
Link: https://gitlab.com/qemu-project/qemu/-/issues/1408
Fixes: 0701a5efa015 ("hw/usb: Add basic i.MX USB Phy support")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 hw/usb/imx-usb-phy.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/hw/usb/imx-usb-phy.c b/hw/usb/imx-usb-phy.c
index 5d7a549e34..1a97b36a11 100644
--- a/hw/usb/imx-usb-phy.c
+++ b/hw/usb/imx-usb-phy.c
@@ -13,6 +13,7 @@
 #include "qemu/osdep.h"
 #include "hw/usb/imx-usb-phy.h"
 #include "migration/vmstate.h"
+#include "qemu/log.h"
 #include "qemu/module.h"
 
 static const VMStateDescription vmstate_imx_usbphy = {
@@ -90,7 +91,15 @@ static uint64_t imx_usbphy_read(void *opaque, hwaddr offset, unsigned size)
         value = s->usbphy[index - 3];
         break;
     default:
-        value = s->usbphy[index];
+        if (index < USBPHY_MAX) {
+            value = s->usbphy[index];
+        } else {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: Read from non-existing USB PHY register 0x%"
+                          HWADDR_PRIx "\n",
+                          __func__, offset);
+            value = 0;
+        }
         break;
     }
     return (uint64_t)value;
@@ -168,7 +177,13 @@ static void imx_usbphy_write(void *opaque, hwaddr offset, uint64_t value,
         s->usbphy[index - 3] ^= value;
         break;
     default:
-        /* Other registers are read-only */
+        /* Other registers are read-only or do not exist */
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Write to %s USB PHY register 0x%"
+                      HWADDR_PRIx "\n",
+                      __func__,
+                      index >= USBPHY_MAX ? "non-existing" : "read-only",
+                      offset);
         break;
     }
 }
-- 
2.39.2



^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2023-03-17 21:51 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-03-16 23:49 [PATCH] hw/usb/imx: Fix out of bounds access in imx_usbphy_read() Guenter Roeck
2023-03-17  9:52 ` Qiang Liu
2023-03-17 13:46 ` Peter Maydell
2023-03-17 21:50 ` Philippe Mathieu-Daudé

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