SMB: Avoid an unsigned integer underflow

diff --git a/print-smb.c b/print-smb.c
index caf05b2a07534410e79531f08721b25194e10cfd..6592c5eb531af6b0684c7719fb77336243dfd307 100644 (file)
--- a/print-smb.c
+++ b/print-smb.c
@@ -1199,7 +1199,7 @@ nbt_udp137_print(netdissect_options *ndo,
                    p = smb_fdata(ndo, p, "NumNames=[B]\n", p + 1, 0);
                    if (p == NULL)
                        goto out;
-                   while (numnames--) {
+                   while (numnames) {
                        p = smb_fdata(ndo, p, "Name=[n2]\t#", maxbuf, 0);
                        if (p == NULL)
                            goto out;
@@ -1224,6 +1224,7 @@ nbt_udp137_print(netdissect_options *ndo,
                            ND_PRINT("<PERMANENT> ");
                        ND_PRINT("\n");
                        p += 2;
+                       numnames--;
                    }
                } else {
                    if (p >= maxbuf)