CVE-2017-13045/VQP: add some bounds checks

[tcpdump] / print-smb.c

diff --git a/print-smb.c b/print-smb.c
index 7330d6b528335b644b01f92ddd4d145087777b99..723b9a032415c00f1503db0b5334e13bdb301a80 100644 (file)
--- a/print-smb.c
+++ b/print-smb.c
@@ -6,6 +6,8 @@
  * or later
  */
 
+/* \summary: SMB/CIFS printer */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -99,7 +101,7 @@ trans2_findfirst(netdissect_options *ndo,
     smb_fdata(ndo, param, fmt, param + pcnt, unicodestr);
     if (dcnt) {
        ND_PRINT((ndo, "data:\n"));
-       print_data(ndo, data, dcnt);
+       smb_print_data(ndo, data, dcnt);
     }
 }
 
@@ -134,7 +136,7 @@ trans2_qfsinfo(netdissect_options *ndo,
     }
     if (dcnt) {
        ND_PRINT((ndo, "data:\n"));
-       print_data(ndo, data, dcnt);
+       smb_print_data(ndo, data, dcnt);
     }
     return;
 trunc:
@@ -415,7 +417,7 @@ print_negprot(netdissect_options *ndo,
        smb_fdata(ndo, words + 1, f1, min(words + 1 + wct * 2, maxbuf),
            unicodestr);
     else
-       print_data(ndo, words + 1, min(wct * 2, PTR_DIFF(maxbuf, words + 1)));
+       smb_print_data(ndo, words + 1, min(wct * 2, PTR_DIFF(maxbuf, words + 1)));
 
     ND_TCHECK2(*data, 2);
     bcc = EXTRACT_LE_16BITS(data);
@@ -425,7 +427,7 @@ print_negprot(netdissect_options *ndo,
            smb_fdata(ndo, data + 2, f2, min(data + 2 + EXTRACT_LE_16BITS(data),
                maxbuf), unicodestr);
        else
-           print_data(ndo, data + 2, min(EXTRACT_LE_16BITS(data), PTR_DIFF(maxbuf, data + 2)));
+           smb_print_data(ndo, data + 2, min(EXTRACT_LE_16BITS(data), PTR_DIFF(maxbuf, data + 2)));
     }
     return;
 trunc:
@@ -459,7 +461,7 @@ print_sesssetup(netdissect_options *ndo,
        smb_fdata(ndo, words + 1, f1, min(words + 1 + wct * 2, maxbuf),
            unicodestr);
     else
-       print_data(ndo, words + 1, min(wct * 2, PTR_DIFF(maxbuf, words + 1)));
+       smb_print_data(ndo, words + 1, min(wct * 2, PTR_DIFF(maxbuf, words + 1)));
 
     ND_TCHECK2(*data, 2);
     bcc = EXTRACT_LE_16BITS(data);
@@ -469,7 +471,7 @@ print_sesssetup(netdissect_options *ndo,
            smb_fdata(ndo, data + 2, f2, min(data + 2 + EXTRACT_LE_16BITS(data),
                maxbuf), unicodestr);
        else
-           print_data(ndo, data + 2, min(EXTRACT_LE_16BITS(data), PTR_DIFF(maxbuf, data + 2)));
+           smb_print_data(ndo, data + 2, min(EXTRACT_LE_16BITS(data), PTR_DIFF(maxbuf, data + 2)));
     }
     return;
 trunc:
@@ -509,7 +511,7 @@ print_lockingandx(netdissect_options *ndo,
            smb_fdata(ndo, data + 2, f2, min(data + 2 + EXTRACT_LE_16BITS(data),
                maxbuf), unicodestr);
        else
-           print_data(ndo, data + 2, min(EXTRACT_LE_16BITS(data), PTR_DIFF(maxbuf, data + 2)));
+           smb_print_data(ndo, data + 2, min(EXTRACT_LE_16BITS(data), PTR_DIFF(maxbuf, data + 2)));
     }
     return;
 trunc:
@@ -804,9 +806,6 @@ print_smb(netdissect_options *ndo,
 
     ND_TCHECK(buf[9]);
     request = (buf[9] & 0x80) ? 0 : 1;
-    flags2 = EXTRACT_LE_16BITS(&buf[10]);
-    unicodestr = flags2 & 0x8000;
-    nterrcodes = flags2 & 0x4000;
     startbuf = buf;
 
     command = buf[4];
@@ -821,6 +820,11 @@ print_smb(netdissect_options *ndo,
     if (ndo->ndo_vflag < 2)
        return;
 
+    ND_TCHECK_16BITS(&buf[10]);
+    flags2 = EXTRACT_LE_16BITS(&buf[10]);
+    unicodestr = flags2 & 0x8000;
+    nterrcodes = flags2 & 0x4000;
+
     /* print out the header */
     smb_fdata(ndo, buf, fmt_smbheader, buf + 33, unicodestr);
 
@@ -882,7 +886,7 @@ print_smb(netdissect_options *ndo,
            } else {
                if (bcc > 0) {
                    ND_PRINT((ndo, "smb_buf[]=\n"));
-                   print_data(ndo, data + 2, min(bcc, PTR_DIFF(maxbuf, data + 2)));
+                   smb_print_data(ndo, data + 2, min(bcc, PTR_DIFF(maxbuf, data + 2)));
                }
            }
        }
@@ -1163,10 +1167,12 @@ nbt_udp137_print(netdissect_options *ndo,
            p = smb_fdata(ndo, p, "Name=[n1]\n#", maxbuf, 0);
            if (p == NULL)
                goto out;
+           ND_TCHECK_16BITS(p);
            restype = EXTRACT_16BITS(p);
            p = smb_fdata(ndo, p, "ResType=[rw]\nResClass=[rw]\nTTL=[rD]\n", p + 8, 0);
            if (p == NULL)
                goto out;
+           ND_TCHECK_16BITS(p);
            rdlen = EXTRACT_16BITS(p);
            ND_PRINT((ndo, "ResourceLength=%d\nResourceData=\n", rdlen));
            p += 2;
@@ -1208,7 +1214,7 @@ nbt_udp137_print(netdissect_options *ndo,
                        p += 2;
                    }
                } else {
-                   print_data(ndo, p, min(rdlen, length - (p - data)));
+                   smb_print_data(ndo, p, min(rdlen, length - (p - data)));
                    p += rdlen;
                }
            }
@@ -1308,7 +1314,7 @@ out:
 /*
    print netbeui frames
 */
-struct nbf_strings {
+static struct nbf_strings {
        const char      *name;
        const char      *nonverbose;
        const char      *verbose;