[Qemu-devel] [PATCHv2] qdev: Validate hex properties

[Hannes Reinecke <hare@suse.de>]

strtoul(l) might overflow, in which case it'll return '-1' and set
the appropriate error code. So update the calls to strtoul(l) when
parsing hex properties to avoid silent overflows.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Eric Blake <eblake@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 hw/core/qdev-properties.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index dc8ae69..5a94c04 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -198,7 +198,10 @@ static int parse_hex8(DeviceState *dev, Property *prop, const char *str)
         return -EINVAL;
     }
 
+    errno = 0;
     *ptr = strtoul(str, &end, 16);
+    if (errno)
+        return -errno;
     if ((*end != '\0') || (end == str)) {
         return -EINVAL;
     }
@@ -329,7 +332,10 @@ static int parse_hex32(DeviceState *dev, Property *prop, const char *str)
         return -EINVAL;
     }
 
+    errno = 0;
     *ptr = strtoul(str, &end, 16);
+    if (errno)
+        return -errno;
     if ((*end != '\0') || (end == str)) {
         return -EINVAL;
     }
@@ -396,7 +402,10 @@ static int parse_hex64(DeviceState *dev, Property *prop, const char *str)
         return -EINVAL;
     }
 
+    errno = 0;
     *ptr = strtoull(str, &end, 16);
+    if (errno)
+        return -errno;
     if ((*end != '\0') || (end == str)) {
         return -EINVAL;
     }
-- 
1.8.1.4