[xen staging] xenstore: add missing NULL check

[patchbot@xxxxxxx]

commit ff3e7e76813a7958e583e6d7e9090ff9b6df1ecd
Author:     Michael Kurth <mku@xxxxxxxxxx>
AuthorDate: Fri Feb 26 15:41:42 2021 +0100
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Wed Mar 3 18:18:45 2021 +0000

    xenstore: add missing NULL check
    
    In case of allocation error, we should not dereference the obtained
    NULL pointer.
    
    This bug was discovered and resolved using Coverity Static Analysis
    Security Testing (SAST) by Synopsys, Inc.
    
    Signed-off-by: Michael Kurth <mku@xxxxxxxxxx>
    Signed-off-by: Norbert Manthey <nmanthey@xxxxxxxxx>
    Reviewed-by: Thomas Friebel <friebelt@xxxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 tools/xenstore/xenstored_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index 8febd09f55..8033c1e0eb 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -504,6 +504,11 @@ int write_node_raw(struct connection *conn, TDB_DATA *key, 
struct node *node,
        }
 
        data.dptr = talloc_size(node, data.dsize);
+       if (!data.dptr) {
+               errno = ENOMEM;
+               return errno;
+       }
+
        hdr = (void *)data.dptr;
        hdr->generation = node->generation;
        hdr->num_perms = node->perms.num;
--
generated by git-patchbot for /home/xen/git/xen.git#staging