[PATCH] tools/libxc: Initialise parameters in map_p2m_list() for error paths

[Andrew Cooper <andrew.cooper3@citrix.com>]

c/s 7bf7458 "libxc: support of linear p2m list for migration of
pv-domains" breaks compilation on CentOS 7 because of 'ptes' being
possibly uninitialised after the 'err:' label.

The migration will fail early for conditions which would cause the for()
loop not to run, but the compiler doesn't know this.

Initialise the parameters to safe default to make the function more
robust.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.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 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libxc/xc_sr_save_x86_pv.c b/tools/libxc/xc_sr_save_x86_pv.c
index 4deb58f..ab4bbe0 100644
--- a/tools/libxc/xc_sr_save_x86_pv.c
+++ b/tools/libxc/xc_sr_save_x86_pv.c
@@ -316,9 +316,9 @@ 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;
+    uint64_t *ptes = NULL;
     xen_pfn_t *mfns;
-    unsigned fpp, n_pages, level, shift, idx_start, idx_end, idx, saved_idx;
+    unsigned fpp, n_pages = 0, level, shift, idx_start, idx_end, idx, saved_idx;
     int rc = -1;
 
     p2m_mfn = cr3_to_mfn(ctx, p2m_cr3);
-- 
2.1.4