[Xen-changelog] [xen stable-4.9] x86/soft-reset: Drop gfn reference after calling get_gfn_query()

[patchbot@xxxxxxx]

commit 194142fff394b13ccd6010f3353d340d4e356b78
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Feb 1 12:02:15 2019 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Feb 1 12:02:15 2019 +0100

    x86/soft-reset: Drop gfn reference after calling get_gfn_query()
    
    get_gfn_query() internally takes the p2m lock, and this error path leaves it
    locked.
    
    This wasn't included in XSA-277 because the error path can only be triggered
    by a carefully timed phymap operation concurrent with the domain being 
paused
    and the toolstack issuing DOMCTL_soft_reset.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: e7969e917cef276318f722a607985a2e896aeb94
    master date: 2018-11-22 17:58:46 +0000
---
 xen/arch/x86/domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 2ca496994d..61f6671872 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -916,7 +916,7 @@ int arch_domain_soft_reset(struct domain *d)
         printk(XENLOG_G_ERR "Failed to get Dom%d's shared_info GFN (%lx)\n",
                d->domain_id, gfn);
         ret = -EINVAL;
-        goto exit_put_page;
+        goto exit_put_gfn;
     }
 
     new_page = alloc_domheap_page(d, 0);
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog