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| author | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2007-04-21 20:12:43 +0900 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:29:35 -0700 |
| commit | 2334e973559e119fa4161047035f03ad97a8676a (patch) | |
| tree | 0c01f78dac17f031ed39e262eea042c4381f9dd7 /net | |
| parent | 9e412ba7632f71259a53085665d4983b78257b7c (diff) | |
| download | linux-3.10-2334e973559e119fa4161047035f03ad97a8676a.tar.gz linux-3.10-2334e973559e119fa4161047035f03ad97a8676a.tar.bz2 linux-3.10-2334e973559e119fa4161047035f03ad97a8676a.zip | |
[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')
| -rw-r--r-- | net/ipv6/proc.c | 22 |
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: |