From: Antonio Quartulli <anto...@openvpn.net>
The problem is visible when compiling with -O2:
ntlm.c: In function ‘ntlm_phase_3’:
ntlm.c:305:9: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
if ((*((long *)&buf2[0x14]) & 0x00800000) == 0x00800000)
The spec suggests to interpret those 4 bytes as a long, but
this needs to be done carefully.
Signed-off-by: Antonio Quartulli <anto...@openvpn.net>
---
I have tried to make the statement more clear and "aliasing safe" at the same
time. However, this is only compiled tested as I have no way to test the whole
NTLM thing. Sorry :(
Cheers,
src/openvpn/ntlm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/openvpn/ntlm.c b/src/openvpn/ntlm.c
index 65c1cbf5..a251c11d 100644
--- a/src/openvpn/ntlm.c
+++ b/src/openvpn/ntlm.c
@@ -302,7 +302,8 @@ ntlm_phase_3(const struct http_proxy_info *p, const char
*phase_2,
/* Add target information block to the blob */
/* Check for Target Information block */
- if ((*((long *)&buf2[0x14]) & 0x00800000) == 0x00800000)
+ unsigned long *flags = (unsigned long *)(buf2 + 0x14);
+ if ((*flags & htonl(0x00800000)) == htonl(0x00800000))
{
tib_len = buf2[0x28]; /* Get Target Information block
size */
if (tib_len > 96)
--
2.14.0
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