[Qemu-devel] [PATCH 1.1 v2] qdev: Fix memory leak

[Qemu-devel] [PATCH 1.1 v2] qdev: Fix memory leak

[dunrong huang]

The str allocated in visit_type_str was not freed.

The visit_type_str function is an input visitor(<QMP/String/etc>-to-native)
here, it will allocate memory for caller, so the caller is responsible for
freeing the memory.

Signed-off-by: dunrong huang <riegamaths@gmail.com>
---
 hw/qdev-properties.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index c5545dc..b7b5597 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -753,10 +753,12 @@ static void set_mac(Object *obj, Visitor *v, void *opaque,
         }
         mac->a[i] = strtol(str+pos, &p, 16);
     }
+    g_free(str);
     return;
 
 inval:
     error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str);
+    g_free(str);
 }
 
 PropertyInfo qdev_prop_macaddr = {
@@ -825,7 +827,7 @@ static void set_pci_devfn(Object *obj, Visitor *v, void *opaque,
     uint32_t *ptr = qdev_get_prop_ptr(dev, prop);
     unsigned int slot, fn, n;
     Error *local_err = NULL;
-    char *str = (char *)"";
+    char *str;
 
     if (dev->state != DEV_STATE_CREATED) {
         error_set(errp, QERR_PERMISSION_DENIED);
@@ -848,10 +850,12 @@ static void set_pci_devfn(Object *obj, Visitor *v, void *opaque,
         goto invalid;
     }
     *ptr = slot << 3 | fn;
+    g_free(str);
     return;
 
 invalid:
     error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str);
+    g_free(str);
 }
 
 static int print_pci_devfn(DeviceState *dev, Property *prop, char *dest, size_t len)
-- 
1.7.8.4

Re: [Qemu-devel] [PATCH 1.1 v2] qdev: Fix memory leak

[Stefan Weil]

Am 18.05.2012 13:14, schrieb dunrong huang:
> The str allocated in visit_type_str was not freed.
>
> The visit_type_str function is an input visitor(<QMP/String/etc>-to-native)
> here, it will allocate memory for caller, so the caller is responsible for
> freeing the memory.
>
> Signed-off-by: dunrong huang<riegamaths@gmail.com>
> ---
>   hw/qdev-properties.c |    6 +++++-
>   1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
> index c5545dc..b7b5597 100644
> --- a/hw/qdev-properties.c
> +++ b/hw/qdev-properties.c
> @@ -753,10 +753,12 @@ static void set_mac(Object *obj, Visitor *v, void *opaque,
>           }
>           mac->a[i] = strtol(str+pos,&p, 16);
>       }
> +    g_free(str);
>       return;
>
>   inval:
>       error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str);
> +    g_free(str);
>   }
>
>   PropertyInfo qdev_prop_macaddr = {
> @@ -825,7 +827,7 @@ static void set_pci_devfn(Object *obj, Visitor *v, void *opaque,
>       uint32_t *ptr = qdev_get_prop_ptr(dev, prop);
>       unsigned int slot, fn, n;
>       Error *local_err = NULL;
> -    char *str = (char *)"";
> +    char *str;
>
>       if (dev->state != DEV_STATE_CREATED) {
>           error_set(errp, QERR_PERMISSION_DENIED);
> @@ -848,10 +850,12 @@ static void set_pci_devfn(Object *obj, Visitor *v, void *opaque,
>           goto invalid;
>       }
>       *ptr = slot<<  3 | fn;
> +    g_free(str);
>       return;
>
>   invalid:
>       error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str);
> +    g_free(str);
>   }
>
>   static int print_pci_devfn(DeviceState *dev, Property *prop, char *dest, size_t len)


Reviewed-by: Stefan Weil <sw@weilnetz.de>