Re: [Qemu-devel] [PATCH] HMP: Initialize err before using

[Dr. David Alan Gilbert]

* Zhangjixiang (address@hidden) wrote:
> From 295640e6f4aa83b843e245bb1af9995be37de84d Mon Sep 17 00:00:00 2001
> From: zhangjixiang <address@hidden>
> Date: Sun, 25 Feb 2018 09:47:51 +0800
> Subject: [PATCH] HMP: Initialize err before using
> 
> When bdrv_snapshot_delete return fail, the errp will not be
> assigned a valid value in error_propagate as errp didn't be
> initialized in hmp_delvm, then error_reportf_err will use an
> uninitialized value(call by hmp_delvm), and qemu crash.
> 
> Signed-off-by: zhangjixiang <address@hidden>
> ---
> hmp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hmp.c b/hmp.c
> index 7870d6a300..4a4da004e9 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -1340,7 +1340,7 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
> void hmp_delvm(Monitor *mon, const QDict *qdict)
> {
>      BlockDriverState *bs;
> -    Error *err;
> +    Error *err = NULL;
>      const char *name = qdict_get_str(qdict, "name");
>      if (bdrv_all_delete_snapshot(name, &bs, &err) < 0) {

OK, that looks right; and that bug seems to have been around for a
while; thank you:

Reviewed-by: Dr. David Alan Gilbert <address@hidden>

(I think the headers on the mail look a bit broken; it's probably best
to use git send-email  when possible).

Dave

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Dr. David Alan Gilbert / address@hidden / Manchester, UK