2 files changed, 129 insertions, 0 deletions

diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/dont-return-incompletely-parsed-varbinds.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/dont-return-incompletely-parsed-varbinds.patch
new file mode 100644
index 000000000..04f2110f3
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/dont-return-incompletely-parsed-varbinds.patch
@@ -0,0 +1,128 @@
+the snmp_pdu_parse() function could leave
+incompletely parsed varBind variables in the list of variables in
+case the parsing of the SNMP PDU failed. If later processing tries to
+operate on the stale and incompletely processed varBind (e.g. when
+printing the variables), this can lead to e.g. crashes or, possibly,
+execution of arbitrary code
+
+Upstream-Status: Backport [net-snmp]
+
+Written-by: Robert Story
+
+diff -Nur net-snmp-5.7.2.1.orig/snmplib/snmp_api.c net-snmp-5.7.2.1/snmplib/snmp_api.c
+--- net-snmp-5.7.2.1.orig/snmplib/snmp_api.c    2015-05-27 11:25:11.563747471 +0800
++++ net-snmp-5.7.2.1/snmplib/snmp_api.c 2015-05-27 13:27:27.724748201 +0800
+@@ -4345,10 +4345,9 @@
+     u_char          type;
+     u_char          msg_type;
+     u_char         *var_val;
+-    int             badtype = 0;
+     size_t          len;
+     size_t          four;
+-    netsnmp_variable_list *vp = NULL;
++    netsnmp_variable_list *vp = NULL, *vplast = NULL;
+     oid             objid[MAX_OID_LEN];
+ 
+     /*
+@@ -4487,38 +4486,24 @@
+                               (ASN_SEQUENCE | ASN_CONSTRUCTOR),
+                               "varbinds");
+     if (data == NULL)
+-        return -1;
++        goto fail;
+ 
+     /*
+      * get each varBind sequence 
+      */
+     while ((int) *length > 0) {
+-        netsnmp_variable_list *vptemp;
+-        vptemp = (netsnmp_variable_list *) malloc(sizeof(*vptemp));
+-        if (NULL == vptemp) {
+-            return -1;
+-        }
+-        if (NULL == vp) {
+-            pdu->variables = vptemp;
+-        } else {
+-            vp->next_variable = vptemp;
+-        }
+-        vp = vptemp;
++        vp = SNMP_MALLOC_TYPEDEF(netsnmp_variable_list);
++        if (NULL == vp)
++            goto fail;
+ 
+-        vp->next_variable = NULL;
+-        vp->val.string = NULL;
+         vp->name_length = MAX_OID_LEN;
+-        vp->name = NULL;
+-        vp->index = 0;
+-        vp->data = NULL;
+-        vp->dataFreeHook = NULL;
+         DEBUGDUMPSECTION("recv", "VarBind");
+         data = snmp_parse_var_op(data, objid, &vp->name_length, &vp->type,
+                                  &vp->val_len, &var_val, length);
+         if (data == NULL)
+-            return -1;
++            goto fail;
+         if (snmp_set_var_objid(vp, objid, vp->name_length))
+-            return -1;
++            goto fail;
+ 
+         len = MAX_PACKET_LENGTH;
+         DEBUGDUMPHEADER("recv", "Value");
+@@ -4583,7 +4568,7 @@
+                 vp->val.string = (u_char *) malloc(vp->val_len);
+             }
+             if (vp->val.string == NULL) {
+-                return -1;
++                goto fail;
+             }
+             asn_parse_string(var_val, &len, &vp->type, vp->val.string,
+                              &vp->val_len);
+@@ -4594,7 +4579,7 @@
+             vp->val_len *= sizeof(oid);
+             vp->val.objid = (oid *) malloc(vp->val_len);
+             if (vp->val.objid == NULL) {
+-                return -1;
++                goto fail;
+             }
+             memmove(vp->val.objid, objid, vp->val_len);
+             break;
+@@ -4606,19 +4591,35 @@
+         case ASN_BIT_STR:
+             vp->val.bitstring = (u_char *) malloc(vp->val_len);
+             if (vp->val.bitstring == NULL) {
+-                return -1;
++                goto fail;
+             }
+             asn_parse_bitstring(var_val, &len, &vp->type,
+                                 vp->val.bitstring, &vp->val_len);
+             break;
+         default:
+             snmp_log(LOG_ERR, "bad type returned (%x)\n", vp->type);
+-            badtype = -1;
++            goto fail;
+             break;
+         }
+         DEBUGINDENTADD(-4);
++
++        if (NULL == vplast) {
++            pdu->variables = vp;
++        } else {
++            vplast->next_variable = vp;
++        }
++        vplast = vp;
++        vp = NULL;
+     }
+-    return badtype;
++    return 0;
++
++  fail:
++    DEBUGMSGTL(("recv", "error while parsing VarBindList\n"));
++    /** if we were parsing a var, remove it from the pdu and free it */
++    if (vp)
++        snmp_free_var(vp);
++
++    return -1;
+ }
+ 
+ /*
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp_5.7.2.1.bb b/meta-networking/recipes-protocols/net-snmp/net-snmp_5.7.2.1.bb
index 93d3a941e..2d9d9740f 100644
--- a/meta-networking/recipes-protocols/net-snmp/net-snmp_5.7.2.1.bb
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp_5.7.2.1.bb
@@ -21,6 +21,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/net-snmp/net-snmp-${PV}.zip \
         file://net-snmp-testing-add-the-output-format-for-ptest.patch \
         file://run-ptest \
         file://0001-Fix-CVE-2014-2285.patch \
+        file://dont-return-incompletely-parsed-varbinds.patch \
 "
 
 SRC_URI[md5sum] = "a2c83518648b0f2a5d378625e45c0e18"