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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2007-04-21 20:12:43 +0900
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:29:35 -0700
commit2334e973559e119fa4161047035f03ad97a8676a (patch)
tree0c01f78dac17f031ed39e262eea042c4381f9dd7 /net/ipv6
parent9e412ba7632f71259a53085665d4983b78257b7c (diff)
[IPV6] SNMP: Avoid unaligned accesses.
Because stats pointer may not be aligned for u64, use memcpy to fill u64 values. Issue reported by David Miller <davem@davemloft.net>. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/proc.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index c847cef626a..aba94316b77 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -210,20 +210,30 @@ static const struct file_operations snmp6_seq_fops = {
};
#endif /* CONFIG_PROC_FS */
+/*
+ * Stats may not be aligned for u64, so use memcpy to avoid
+ * unaligned accesses.
+ */
+static inline void __set_u64(void *p, u64 v)
+{
+ memcpy(p, &v, sizeof(u64));
+}
+
static inline void
-__snmp6_fill_stats(u64 *stats, void **mib, int items, int bytes)
+__snmp6_fill_stats(void *stats, void **mib, int items, int bytes)
{
int i;
+ u8 *p = stats;
int pad = bytes - sizeof(u64) * items;
BUG_ON(pad < 0);
- stats[0] = items;
- for (i = 1; i < items; i++)
- stats[i] = (u64)fold_field(mib, i);
- memset(&stats[items], 0, pad);
+ __set_u64(p, items);
+ for (i = 1, p += sizeof(u64); i < items; i++, p += sizeof(u64))
+ __set_u64(p, fold_field(mib, i));
+ memset(p, 0, pad);
}
void
-snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, int bytes)
+snmp6_fill_stats(void *stats, struct inet6_dev *idev, int attrtype, int bytes)
{
switch(attrtype) {
case IFLA_INET6_STATS: