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| author | Jafar Al-Gharaibeh <jafar@atcorp.com> | 2024-09-11 00:01:30 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-09-11 00:01:30 -0400 |
| commit | c70952802837e9d3e8a30d4638d21c51e047d90b (patch) | |
| tree | 910847260efb8230a0e909cb27ea3ce182b5ed14 | |
| parent | 76b0754c53ee06b2cfd7a50c18cbbf363f8bb2af (diff) | |
| parent | 8b0130aaf45836c99894b7839a6c8c2bedd9f10e (diff) | |
Merge pull request #16785 from FRRouting/mergify/bp/stable/9.1/pr-16718
isisd: fix crash when reading asla (backport #16718)
| -rw-r--r-- | isisd/isis_tlvs.c | 13 | ||||
| -rw-r--r-- | isisd/isis_tlvs.h | 1 |
2 files changed, 12 insertions, 2 deletions
diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c index aaa88a058c..59d632d170 100644 --- a/isisd/isis_tlvs.c +++ b/isisd/isis_tlvs.c @@ -1448,8 +1448,8 @@ static int unpack_item_ext_subtlv_asla(uint16_t mtid, uint8_t subtlv_len, uint8_t sabm_flag_len; /* User-defined App Identifier Bit Flags/Length */ uint8_t uabm_flag_len; - uint8_t sabm[ASLA_APP_IDENTIFIER_BIT_LENGTH] = {0}; - uint8_t uabm[ASLA_APP_IDENTIFIER_BIT_LENGTH] = {0}; + uint8_t sabm[ASLA_APP_IDENTIFIER_BIT_MAX_LENGTH] = { 0 }; + uint8_t uabm[ASLA_APP_IDENTIFIER_BIT_MAX_LENGTH] = { 0 }; uint8_t readable = subtlv_len; uint8_t subsubtlv_type; uint8_t subsubtlv_len; @@ -1480,6 +1480,15 @@ static int unpack_item_ext_subtlv_asla(uint16_t mtid, uint8_t subtlv_len, return -1; } + if ((asla->standard_apps_length > ASLA_APP_IDENTIFIER_BIT_MAX_LENGTH) || + (asla->user_def_apps_length > ASLA_APP_IDENTIFIER_BIT_MAX_LENGTH)) { + zlog_err("Standard or User-Defined Application Identifier Bit Mask Length greater than %u bytes. Received respectively a length of %u and %u bytes.", + ASLA_APP_IDENTIFIER_BIT_MAX_LENGTH, + asla->standard_apps_length, asla->user_def_apps_length); + stream_forward_getp(s, readable); + return -1; + } + for (int i = 0; i < asla->standard_apps_length; i++) sabm[i] = stream_getc(s); for (int i = 0; i < asla->user_def_apps_length; i++) diff --git a/isisd/isis_tlvs.h b/isisd/isis_tlvs.h index 6ecd4c5f6a..c64bbf7f69 100644 --- a/isisd/isis_tlvs.h +++ b/isisd/isis_tlvs.h @@ -717,6 +717,7 @@ struct isis_ext_subtlvs { #define ISIS_SABM_FLAG_X 0x10 /* Flex-Algorithm - RFC9350 */ #define ASLA_APP_IDENTIFIER_BIT_LENGTH 1 +#define ASLA_APP_IDENTIFIER_BIT_MAX_LENGTH 8 #define ASLA_LEGACY_FLAG 0x80 #define ASLA_APPS_LENGTH_MASK 0x7f |