s3:smbd: Fix possible null pointer dereference in token_contains_name()

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14572

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
Autobuild-User(master): Alexander Bokovoy <ab@samba.org>
Autobuild-Date(master): Thu Nov 12 15:13:47 UTC 2020 on sn-devel-184

diff --git a/source3/smbd/share_access.c b/source3/smbd/share_access.c
index 57754a0f7663b9e19195af5509177b68d060a932..694c0c290e8173d7dbb608761f8128d1ba289b71 100644 (file)
--- a/source3/smbd/share_access.c
+++ b/source3/smbd/share_access.c
@@ -79,7 +79,7 @@ static bool token_contains_name(TALLOC_CTX *mem_ctx,
        enum lsa_SidType type;
 
        if (username != NULL) {
-               size_t domain_len = strlen(domain);
+               size_t domain_len = domain != NULL ? strlen(domain) : 0;
 
                /* Check if username starts with domain name */
                if (domain_len > 0) {