Re: [PATCH v2 09/18] qga: Fix guest-get-fsinfo error API violations

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 12/4/19 10:36 AM, Markus Armbruster wrote:
> build_guest_fsinfo_for_virtual_device() dereferences @errp when
> build_guest_fsinfo_for_device() fails.  That's wrong; see the big
> comment in error.h.  Introduced in commit 46d4c5723e "qga: Add
> guest-get-fsinfo command".
> 
> No caller actually passes null.
> 
> Fix anyway: splice in a local Error *err, and error_propagate().
> 
> Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>   qga/commands-posix.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/qga/commands-posix.c b/qga/commands-posix.c
> index 1c1a165dae..0be527ccb8 100644
> --- a/qga/commands-posix.c
> +++ b/qga/commands-posix.c
> @@ -1049,6 +1049,7 @@ static void build_guest_fsinfo_for_virtual_device(char const *syspath,
>                                                     GuestFilesystemInfo *fs,
>                                                     Error **errp)
>   {
> +    Error *err = NULL;
>       DIR *dir;
>       char *dirpath;
>       struct dirent *entry;
> @@ -1078,10 +1079,11 @@ static void build_guest_fsinfo_for_virtual_device(char const *syspath,
>   
>               g_debug(" slave device '%s'", entry->d_name);
>               path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
> -            build_guest_fsinfo_for_device(path, fs, errp);
> +            build_guest_fsinfo_for_device(path, fs, &err);
>               g_free(path);
>   
> -            if (*errp) {
> +            if (err) {
> +                error_propagate(errp, err);
>                   break;
>               }
>           }
> 

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>