For NUL terminated string, need always be sure of ended by '\0'.
'prefix' max length is 128 (NF_LOG_PREFIXLEN), and 'pm->prefix' max
length is 32 (ULOG_PREFIX_LEN), so really need notice it.
'pm' is 'struct ulog_packet_msg_t' which may be copied to user mode
(defined in "include/uapi/..."), so can not use strlcpy() instead of.
Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
---
net/ipv4/netfilter/ipt_ULOG.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index cf08218..ff4b781 100644
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -231,8 +231,10 @@ static void ipt_ulog_packet(struct net *net,
put_unaligned(tv.tv_usec, &pm->timestamp_usec);
put_unaligned(skb->mark, &pm->mark);
pm->hook = hooknum;
- if (prefix != NULL)
- strncpy(pm->prefix, prefix, sizeof(pm->prefix));
+ if (prefix != NULL) {
+ strncpy(pm->prefix, prefix, sizeof(pm->prefix) - 1);
+ pm->prefix[sizeof(pm->prefix) - 1] = '\0';
+ }
else if (loginfo->prefix[0] != '\0')
strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
else
--
1.7.7.6
--
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