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AP MLD: More careful checking of Multi-Link element length fields

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Avoid potential read of one or two octets beyond the end of the
subelement when verifying that there is sufficient amount of data
included in each subelement/element within the MLE in Association
Request frames.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2023-12-17 21:55:10 +02:00
parent 38a5ed5fda
commit 828311ef31
1 changed files with 3 additions and 2 deletions
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5
src/common/ieee802_11_common.c
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@ -1004,7 +1004,7 @@ ParseRes ieee802_11_parse_link_assoc_req(const u8 *start, size_t len,
continue;
}
if (sub_elem_len < 3) {
if (sub_elem_len < 5) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: error: sub_elem_len=%zu < 5",
@ -1073,7 +1073,8 @@ ParseRes ieee802_11_parse_link_assoc_req(const u8 *start, size_t len,
non_inherit_len -= 1 + non_inherit[0];
non_inherit += 1 + non_inherit[0];
if (non_inherit_len < 1UL + non_inherit[0]) {
if (non_inherit_len < 1UL ||
non_inherit_len < 1UL + non_inherit[0]) {
if (show_errors)
wpa_printf(MSG_DEBUG,
"MLD: Invalid inheritance");