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authorHerbert Xu <herbert@gondor.apana.org.au>2023-01-10 08:59:06 +0800
committerDavid S. Miller <davem@davemloft.net>2023-01-11 12:49:13 +0000
commitcb3e9864cdbe35ff6378966660edbcbac955fe17 (patch)
treeb73a6047169b6808010589b86a82e337946611ef /net/ipv6
parentb0e380b5d4275299adf43e249f18309331b6f54f (diff)
downloadlinux-cb3e9864cdbe35ff6378966660edbcbac955fe17.tar.bz2
ipv6: raw: Deduct extension header length in rawv6_push_pending_frames
The total cork length created by ip6_append_data includes extension headers, so we must exclude them when comparing them against the IPV6_CHECKSUM offset which does not include extension headers. Reported-by: Kyle Zeng <zengyhkyle@gmail.com> Fixes: 357b40a18b04 ("[IPV6]: IPV6_CHECKSUM socket option can corrupt kernel memory") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/raw.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index a06a9f847db5..ada087b50541 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -505,6 +505,7 @@ csum_copy_err:
static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
struct raw6_sock *rp)
{
+ struct ipv6_txoptions *opt;
struct sk_buff *skb;
int err = 0;
int offset;
@@ -522,6 +523,9 @@ static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
offset = rp->offset;
total_len = inet_sk(sk)->cork.base.length;
+ opt = inet6_sk(sk)->cork.opt;
+ total_len -= opt ? opt->opt_flen : 0;
+
if (offset >= total_len - 1) {
err = -EINVAL;
ip6_flush_pending_frames(sk);