[xen stable-4.17] tools/xenstore: fix XSA-417 patch

[patchbot@xxxxxxx]

commit 6c442499dc45425bb6dec0f97ca950abb0046081
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Aug 3 16:30:27 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 3 16:30:27 2023 +0200

    tools/xenstore: fix XSA-417 patch
    
    The fix for XSA-417 had a bug: domain_alloc_permrefs() will not return
    a negative value in case of an error, but a plain errno value.
    
    Note this is not considered to be a security issue, as the only case
    where domain_alloc_permrefs() will return an error is a failed memory
    allocation. As a guest should not be able to drive Xenstore out of
    memory, this is NOT a problem a guest can trigger at will.
    
    Fixes: ab128218225d ("tools/xenstore: fix checking node permissions")
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    master commit: 0c53c638e16278078371ce028c74693841d7738a
    master date: 2023-07-21 08:32:43 +0200
---
 tools/xenstore/xenstored_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index 8907c6cb0b..09b5d0656f 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -1780,7 +1780,7 @@ static int do_set_perms(const void *ctx, struct 
connection *conn,
        if (!xs_strings_to_perms(perms.p, perms.num, permstr))
                return errno;
 
-       if (domain_alloc_permrefs(&perms) < 0)
+       if (domain_alloc_permrefs(&perms))
                return ENOMEM;
        if (perms.p[0].perms & XS_PERM_IGNORE)
                return ENOENT;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.17