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-rw-r--r--net/sched/act_pedit.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index b54d56d4959b..cf9b2fe8eac6 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -108,6 +108,17 @@ static void tcf_pedit_cleanup(struct tc_action *a, int bind)
kfree(keys);
}
+static bool offset_valid(struct sk_buff *skb, int offset)
+{
+ if (offset > 0 && offset > skb->len)
+ return false;
+
+ if (offset < 0 && -offset > skb_headroom(skb))
+ return false;
+
+ return true;
+}
+
static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
@@ -134,6 +145,11 @@ static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
if (tkey->offmask) {
char *d, _d;
+ if (!offset_valid(skb, off + tkey->at)) {
+ pr_info("tc filter pedit 'at' offset %d out of bounds\n",
+ off + tkey->at);
+ goto bad;
+ }
d = skb_header_pointer(skb, off + tkey->at, 1,
&_d);
if (!d)
@@ -146,10 +162,10 @@ static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
" offset must be on 32 bit boundaries\n");
goto bad;
}
- if (offset > 0 && offset > skb->len) {
- pr_info("tc filter pedit"
- " offset %d can't exceed pkt length %d\n",
- offset, skb->len);
+
+ if (!offset_valid(skb, off + offset)) {
+ pr_info("tc filter pedit offset %d out of bounds\n",
+ offset);
goto bad;
}