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dhcpv4: fix out of bound access in dhcpv4_put
[project/odhcpd.git]
/
src
/
dhcpv4.c
diff --git
a/src/dhcpv4.c
b/src/dhcpv4.c
index
2b30307
..
b803359
100644
(file)
--- a/
src/dhcpv4.c
+++ b/
src/dhcpv4.c
@@
-493,7
+493,9
@@
static void dhcpv4_put(struct dhcpv4_message *msg, uint8_t **cookie,
uint8_t type, uint8_t len, const void *data)
{
uint8_t *c = *cookie;
- if (*cookie + 2 + len > (uint8_t*)&msg[1])
+ uint8_t *end = (uint8_t *)msg + sizeof(*msg);
+
+ if (*cookie + 2 + len > end)
return;
*c++ = type;