Changeset 502 for trunk/src/sh_static.c

Timestamp:

Mar 5, 2016, 11:02:21 AM (9 years ago)

Author:

katerina

Message:

Tighter sanity checks in sh_static.c

File:

• trunk/src/sh_static.c (modified) (8 diffs)

trunk/src/sh_static.c

@@ -1052 +1052 @@
         if (!data)
                 return -1;
+        if ((offset < 0) || (offset > (PACKETSZ-1)))
+                return -1;
         while ((l=data[offset])) {
-                if (offset < INT_MAX) offset++;
+                if (offset < (PACKETSZ-1)) offset++;
                 else return -1;
                 if (measure)
@@ -1062 +1064 @@
                         /* compressed item, redirect */ 
                         offset = ((l & 0x3f) << 8) | data[offset];
-                        if (offset < 0)
+                        if ((offset < 0) || (offset > (PACKETSZ-1)))
                           return -1; 
                         measure = 0;
@@ -1076 +1078 @@
                 memcpy(dest + used, data + offset, l);
                 
-                if (offset <= (INT_MAX - l))
+                if (offset <= ((PACKETSZ-1) - l))
                   offset += l;
                 else
@@ -1088 +1090 @@
                   { if (total <= (INT_MAX -l)) total += l; else return -1; }
 
-                if (used == INT_MAX)
+                if (used >= maxlen)
                   return -1;
                 if (data[offset] != 0)
@@ -1113 +1115 @@
 
         i = __decode_dotted(message, offset, temp, sizeof(temp));
-        if (i < 0)
-                return i;
-
-        if (offset <= (INT_MAX - i))
+        if (i < 0 || i > PACKETSZ)
+                return -1;
+
+        if (offset <= ((PACKETSZ - 10) - i))
           message += offset + i;
         else
@@ -1349 +1351 @@
                 }
 
+                /* ok because we have checked that recv at least HFIXEDSZ */
                 __decode_header(packet, &h);
 
@@ -1382 +1385 @@
                                 goto again;
                         pos += i;
+                        if (pos >= PACKETSZ)
+                                goto again;
                 }
                 DPRINTF("Decoding answer at pos %d\n", pos);
@@ -1400 +1405 @@
                     free(a->dotted);
                     pos += i;
+                    if (pos >= PACKETSZ)
+                            goto again;
                 }