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authorDavid S. Miller <davem@sunset.davemloft.net>2006-10-12 00:49:15 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-10-12 00:49:15 -0700
commit8238b218ec883adb44d710960a031c76105274cd (patch)
tree09880b229d0090298f30bf0168a4702bbc0e918a /net/ipv4/route.c
parent42b6785eeb40fe3e9dab9981b6e3231a77c7c2f6 (diff)
[NET]: Do not memcmp() over pad bytes of struct flowi.
They are not necessarily initialized to zero by the compiler, for example when using run-time initializers of automatic on-stack variables. Noticed by Eric Dumazet and Patrick McHardy. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
-rw-r--r--net/ipv4/route.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c41ddba02e9..925ee4dfc32 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -566,9 +566,15 @@ static inline u32 rt_score(struct rtable *rt)
static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
{
- return memcmp(&fl1->nl_u.ip4_u, &fl2->nl_u.ip4_u, sizeof(fl1->nl_u.ip4_u)) == 0 &&
- fl1->oif == fl2->oif &&
- fl1->iif == fl2->iif;
+ return ((fl1->nl_u.ip4_u.daddr ^ fl2->nl_u.ip4_u.daddr) |
+ (fl1->nl_u.ip4_u.saddr ^ fl2->nl_u.ip4_u.saddr) |
+#ifdef CONFIG_IP_ROUTE_FWMARK
+ (fl1->nl_u.ip4_u.fwmark ^ fl2->nl_u.ip4_u.fwmark) |
+#endif
+ (*(u16 *)&fl1->nl_u.ip4_u.tos ^
+ *(u16 *)&fl2->nl_u.ip4_u.tos) |
+ (fl1->oif ^ fl2->oif) |
+ (fl1->iif ^ fl2->iif)) == 0;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED