Re: [PATCH v2] tools/libxc: Adjust error handling in map_p2m_list() to fix CentOS 7 build

[Juergen Gross <jgross@suse.com>]

On 08/01/16 15:38, Andrew Cooper wrote:
> The "goto err;" for malloc() error handling would cause the cleanup code
> to use 'ptes' before it had been initialised, and causing a build
> failure because of -Werror=maybe-uninitialised.
> 
> Use "goto err;" consistently for all error handling.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

Reviewed-by: Juergen Gross <jgross@suse.com>

> ---
> CC: Ian Campbell <Ian.Campbell@citrix.com>
> CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>
> CC: Juergen Gross <jgross@suse.com>
> ---
>  tools/libxc/xc_sr_save_x86_pv.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/libxc/xc_sr_save_x86_pv.c b/tools/libxc/xc_sr_save_x86_pv.c
> index 4deb58f..4a29460 100644
> --- a/tools/libxc/xc_sr_save_x86_pv.c
> +++ b/tools/libxc/xc_sr_save_x86_pv.c
> @@ -316,8 +316,8 @@ static int map_p2m_list(struct xc_sr_context *ctx, uint64_t p2m_cr3)
>      xc_interface *xch = ctx->xch;
>      xen_vaddr_t p2m_vaddr, p2m_end, mask, off;
>      xen_pfn_t p2m_mfn, mfn, saved_mfn, max_pfn;
> -    uint64_t *ptes;
> -    xen_pfn_t *mfns;
> +    uint64_t *ptes = NULL;
> +    xen_pfn_t *mfns = NULL;
>      unsigned fpp, n_pages, level, shift, idx_start, idx_end, idx, saved_idx;
>      int rc = -1;
>  
> @@ -327,7 +327,7 @@ static int map_p2m_list(struct xc_sr_context *ctx, uint64_t p2m_cr3)
>      {
>          ERROR("Bad p2m_cr3 value %#" PRIx64, p2m_cr3);
>          errno = ERANGE;
> -        return -1;
> +        goto err;
>      }
>  
>      get_p2m_generation(ctx);
> @@ -350,7 +350,7 @@ static int map_p2m_list(struct xc_sr_context *ctx, uint64_t p2m_cr3)
>              ERROR("Bad virtual p2m address range %#" PRIx64 "-%#" PRIx64,
>                    p2m_vaddr, p2m_end);
>              errno = ERANGE;
> -            return -1;
> +            goto err;
>          }
>      }
>      else
> @@ -363,7 +363,7 @@ static int map_p2m_list(struct xc_sr_context *ctx, uint64_t p2m_cr3)
>              ERROR("Bad virtual p2m address range %#" PRIx64 "-%#" PRIx64,
>                    p2m_vaddr, p2m_end);
>              errno = ERANGE;
> -            return -1;
> +            goto err;
>          }
>      }
>  
>