[xen staging] x86/hvm: Fix memory leaks in hvm_copy_context_and_params()

[patchbot@xxxxxxx]

commit 3d6e92e309987c9e33177c9ccd155e58dbd5d0db
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Sat May 16 13:10:07 2020 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon May 18 15:22:53 2020 +0100

    x86/hvm: Fix memory leaks in hvm_copy_context_and_params()
    
    Any error from hvm_save() or hvm_set_param() leaks the c.data allocation.
    
    Spotted by Coverity.
    
    Fixes: 353744830 "x86/hvm: introduce hvm_copy_context_and_params"
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 814b7020d8..0a3797ef6e 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -5318,7 +5318,7 @@ int hvm_copy_context_and_params(struct domain *dst, 
struct domain *src)
         return -ENOMEM;
 
     if ( (rc = hvm_save(src, &c)) )
-        return rc;
+        goto out;
 
     for ( i = 0; i < HVM_NR_PARAMS; i++ )
     {
@@ -5328,11 +5328,13 @@ int hvm_copy_context_and_params(struct domain *dst, 
struct domain *src)
             continue;
 
         if ( (rc = hvm_set_param(dst, i, value)) )
-            return rc;
+            goto out;
     }
 
     c.cur = 0;
     rc = hvm_load(dst, &c);
+
+ out:
     vfree(c.data);
 
     return rc;
--
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