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Patch by Stéphane Lesage:

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fixed bug #35536 SNMP: error too big response is malformed
This commit is contained in:
goldsimon 2012-02-16 08:01:54 +01:00
parent 8c5edcf564
commit 6b37e7ec74
3 changed files with 29 additions and 17 deletions
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3
CHANGELOG
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@ -62,6 +62,9 @@ HISTORY
++ Bugfixes:
2012-02-16: Simon Goldschmidt (patch by Stéphane Lesage)
* msg_in.c, msg_out.c: fixed bug #35536 SNMP: error too big response is malformed
2012-02-15: Simon Goldschmidt
* init.c: fixed bug #35537: MEMP_NUM_* sanity checks should be disabled with
MEMP_MEM_MALLOC==1

34
src/core/snmp/msg_in.c
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@ -90,7 +90,7 @@ snmp_init(void)
trap_msg.pcb = snmp1_pcb;
#ifdef SNMP_PRIVATE_MIB_INIT
/* If defined, rhis must be a function-like define to initialize the
/* If defined, this must be a function-like define to initialize the
* private MIB after the stack has been initialized.
* The private MIB can also be initialized in tcpip_callback (or after
* the stack is initialized), this define is only for convenience. */
@ -105,13 +105,28 @@ snmp_init(void)
static void
snmp_error_response(struct snmp_msg_pstat *msg_ps, u8_t error)
{
/* move names back from outvb to invb */
int v;
struct snmp_varbind *vbi = msg_ps->invb.head;
struct snmp_varbind *vbo = msg_ps->outvb.head;
for (v=0; v<msg_ps->vb_idx; v++) {
vbi->ident_len = vbo->ident_len;
vbo->ident_len = 0;
vbi->ident = vbo->ident;
vbo->ident = NULL;
vbi = vbi->next;
vbo = vbo->next;
}
/* free outvb */
snmp_varbind_list_free(&msg_ps->outvb);
/* we send invb back */
msg_ps->outvb = msg_ps->invb;
msg_ps->invb.head = NULL;
msg_ps->invb.tail = NULL;
msg_ps->invb.count = 0;
msg_ps->error_status = error;
msg_ps->error_index = 1 + msg_ps->vb_idx;
/* error index must be 0 for error too big */
msg_ps->error_index = (error != SNMP_ES_TOOBIG) ? (1 + msg_ps->vb_idx) : 0;
snmp_send_response(msg_ps);
snmp_varbind_list_free(&msg_ps->outvb);
msg_ps->state = SNMP_MSG_EMPTY;
@ -182,7 +197,6 @@ snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
/* allocate output varbind */
vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
LWIP_ASSERT("vb != NULL",vb != NULL);
if (vb != NULL)
{
vb->next = NULL;
@ -202,7 +216,6 @@ snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
{
LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
vb->value = memp_malloc(MEMP_SNMP_VALUE);
LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
if (vb->value != NULL)
{
en->get_value_a(request_id, &msg_ps->ext_object_def, vb->value_len, vb->value);
@ -297,7 +310,6 @@ snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
msg_ps->state = SNMP_MSG_INTERNAL_GET_VALUE;
/* allocate output varbind */
vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
LWIP_ASSERT("vb != NULL",vb != NULL);
if (vb != NULL)
{
vb->next = NULL;
@ -318,7 +330,6 @@ snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low",
vb->value_len <= SNMP_MAX_VALUE_SIZE);
vb->value = memp_malloc(MEMP_SNMP_VALUE);
LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
if (vb->value != NULL)
{
mn->get_value(&object_def, vb->value_len, vb->value);
@ -331,6 +342,8 @@ snmp_msg_get_event(u8_t request_id, struct snmp_msg_pstat *msg_ps)
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_msg_event: couldn't allocate variable space\n"));
msg_ps->vb_ptr->ident = vb->ident;
msg_ps->vb_ptr->ident_len = vb->ident_len;
vb->ident = NULL;
vb->ident_len = 0;
memp_free(MEMP_SNMP_VARBIND, vb);
snmp_error_response(msg_ps,SNMP_ES_TOOBIG);
}
@ -1305,7 +1318,6 @@ snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
struct snmp_varbind *vb;
vb = (struct snmp_varbind *)memp_malloc(MEMP_SNMP_VARBIND);
LWIP_ASSERT("vb != NULL",vb != NULL);
if (vb != NULL)
{
u8_t i;
@ -1319,9 +1331,9 @@ snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
LWIP_ASSERT("SNMP_MAX_TREE_DEPTH is configured too low", i <= SNMP_MAX_TREE_DEPTH);
/* allocate array of s32_t for our object identifier */
vb->ident = (s32_t*)memp_malloc(MEMP_SNMP_VALUE);
LWIP_ASSERT("vb->ident != NULL",vb->ident != NULL);
if (vb->ident == NULL)
{
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate ident value space\n"));
memp_free(MEMP_SNMP_VARBIND, vb);
return NULL;
}
@ -1343,9 +1355,9 @@ snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
LWIP_ASSERT("SNMP_MAX_OCTET_STRING_LEN is configured too low", vb->value_len <= SNMP_MAX_VALUE_SIZE);
/* allocate raw bytes for our object value */
vb->value = memp_malloc(MEMP_SNMP_VALUE);
LWIP_ASSERT("vb->value != NULL",vb->value != NULL);
if (vb->value == NULL)
{
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate value space\n"));
if (vb->ident != NULL)
{
memp_free(MEMP_SNMP_VALUE, vb->ident);
@ -1360,6 +1372,10 @@ snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len)
vb->value = NULL;
}
}
else
{
LWIP_DEBUGF(SNMP_MSG_DEBUG, ("snmp_varbind_alloc: couldn't allocate varbind space\n"));
}
return vb;
}

7
src/core/snmp/msg_out.c
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@ -145,14 +145,7 @@ snmp_send_response(struct snmp_msg_pstat *m_stat)
/* pass 1, size error, encode packet ino the pbuf(s) */
ofs = snmp_resp_header_enc(m_stat, p);
if (m_stat->error_status == SNMP_ES_TOOBIG)
{
snmp_varbind_list_enc(&emptyvb, p, ofs);
}
else
{
snmp_varbind_list_enc(&m_stat->outvb, p, ofs);
}
switch (m_stat->error_status)
{