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authorEric Dumazet <edumazet@google.com>2017-02-03 00:03:26 -0800
committerDavid S. Miller <davem@davemloft.net>2017-02-04 19:44:22 -0500
commitd71b7896886345c53ef1d84bda2bc758554f5d61 (patch)
treee89546d474872302fd1503e07f25bc48f6983039 /net/ipv4
parent34b2cef20f19c87999fff3da4071e66937db9644 (diff)
netlabel: out of bound access in cipso_v4_validate()
syzkaller found another out of bound access in ip_options_compile(), or more exactly in cipso_v4_validate() Fixes: 20e2a8648596 ("cipso: handle CIPSO options correctly when NetLabel is disabled") Fixes: 446fda4f2682 ("[NetLabel]: CIPSOv4 engine") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Paul Moore <paul@paul-moore.com> Acked-by: Paul Moore <paul@paul-moore.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/cipso_ipv4.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 72d6f056d863..ae206163c273 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1587,6 +1587,10 @@ int cipso_v4_validate(const struct sk_buff *skb, unsigned char **option)
goto validate_return_locked;
}
+ if (opt_iter + 1 == opt_len) {
+ err_offset = opt_iter;
+ goto validate_return_locked;
+ }
tag_len = tag[1];
if (tag_len > (opt_len - opt_iter)) {
err_offset = opt_iter + 1;