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ProxyARP: Use more robust DHCP option parsing

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Do not depend on undefined behavior with pointer arithmetic when
checking whether there is sufficient room for an option.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2017-01-31 14:43:56 +02:00 committed by Jouni Malinen
parent e64c13febb
commit 5a9d504938
1 changed files with 2 additions and 0 deletions
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2
src/ap/dhcp_snoop.c
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@ -62,6 +62,8 @@ static void handle_dhcp(void *ctx, const u8 *src_addr, const u8 *buf,
if (*opt == DHCP_OPT_PAD)
continue;
if (pos >= end || 1 + *pos > end - pos)
break;
pos += *pos + 1;
if (pos >= end)
break;