jeltz/hostap
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

EAP-IKEv2 peer: Avoid undefined behavior in pointer arithmetic

Browse source 
Reorder terms in a way that no invalid pointers are generated with
pos+len operations. end-pos is always defined (with a valid pos pointer)
while pos+len could end up pointing beyond the end pointer which would
be undefined behavior.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-10-18 11:25:25 +03:00
parent 0421d47e34
commit 3991cb7b3c
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/eap_peer/ikev2.c
View file

@ -128,7 +128,7 @@ static int ikev2_parse_transform(struct ikev2_proposal_data *prop,
t = (const struct ikev2_transform *) pos;
transform_len = WPA_GET_BE16(t->transform_length);
if (transform_len < (int) sizeof(*t) || pos + transform_len > end) {
if (transform_len < (int) sizeof(*t) || transform_len > end - pos) {
wpa_printf(MSG_INFO, "IKEV2: Invalid transform length %d",
transform_len);
return -1;
@ -248,7 +248,7 @@ static int ikev2_parse_proposal(struct ikev2_proposal_data *prop,
ppos = (const u8 *) (p + 1);
pend = pos + proposal_len;
if (ppos + p->spi_size > pend) {
if (p->spi_size > pend - ppos) {
wpa_printf(MSG_INFO, "IKEV2: Not enough room for SPI "
"in proposal");
return -1;