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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2023-01-10 08:59:06 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-01-11 12:49:13 +0000 |
| commit | cb3e9864cdbe35ff6378966660edbcbac955fe17 (patch) | |
| tree | b73a6047169b6808010589b86a82e337946611ef /net/ipv6 | |
| parent | b0e380b5d4275299adf43e249f18309331b6f54f (diff) | |
| download | linux-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.c | 4 |
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); |