[libvirt] [PATCH] mdev: Fix mingw build by adding a check for non-NULL pointer

[Peter Krempa]

On Thu, May 04, 2017 at 13:32:35 +0200, Erik Skultety wrote:
> This patch fixes the following MinGW error (although actually being a
> false positive):
> 
> ../../src/util/virmdev.c: In function 'virMediatedDeviceListMarkDevices':
> ../../src/util/virmdev.c:453:21: error: potential null pointer
> dereference [-Werror=null-dereference]
>           const char *mdev_path = mdev->path;
>                       ^~~~~~~~~
> 
> Signed-off-by: Erik Skultety <eskultet at redhat.com>
> ---
> Pushed under the build breaker rule.
> 
> Erik
> 
>  src/util/virmdev.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/src/util/virmdev.c b/src/util/virmdev.c
> index c861d21..174f48c 100644
> --- a/src/util/virmdev.c
> +++ b/src/util/virmdev.c
> @@ -449,9 +449,13 @@ virMediatedDeviceListMarkDevices(virMediatedDeviceListPtr dst,
>  
>      virObjectLock(dst);
>      for (i = 0; i < count; i++) {
> +        const char *mdev_path = NULL;
>          virMediatedDevicePtr mdev = virMediatedDeviceListGet(src, i);

This does not set an error, ...

> -        const char *mdev_path = mdev->path;
>  
> +        if (!mdev)
> +            goto cleanup;

so this function will sometimes report an error and sometimes will not.

> +
> +        mdev_path = mdev->path;
>          if (virMediatedDeviceIsUsed(mdev, dst) ||
>              virMediatedDeviceSetUsedBy(mdev, drvname, domname) < 0)

E.g.: Both of these report an error.

>              goto cleanup;
> -- 
> 2.9.3
> 
> --
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