lwIP - A Lightweight TCP/IP stack - Bugs: bug #64847, Error in sendtrap v2c
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bug #64847: Error in sendtrap v2c
Submitter: | Andrew <andi> | ||
Submitted: | Fri 03 Nov 2023 08:11:53 AM UTC | ||
Category: | None | Severity: | 3 - Normal |
Item Group: | None | Status: | None |
Privacy: | Public | Assigned to: | None |
Open/Closed: | Open | Planned Release: | None |
lwIP version: | 2.2.0 |
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Depends on the following items: None found
Items that depend on this one: None found
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Corresponding source code
There are bug in snmp_traps.c
Line 394-395
Now:
if (trap_msg->snmp_version == SNMP_VERSION_2c) {
struct snmp_obj_id snmp_trap_oid = { 0 }; /* used for...
Need:
struct snmp_obj_id snmp_trap_oid = { 0 }; /* used for ...
if (trap_msg->snmp_version == SNMP_VERSION_2c) {
An OID is created, a pointer is written to it in varbind[1].value.
The memory will be cleared when we leave the curly braces, and the snmp_varbind_len structure will be located in the same place. When calculating the length of varbind[1].value is corrupted.
(In snmp_trap_varbind_sum
and snmp_asn1_enc_length_cnt)