From: Eric Dumazet <edumazet@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ Upstream commit d71b7896886345c53ef1d84bda2bc758554f5d61 ]
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@xxxxxxxxxx>
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Paul Moore <paul@xxxxxxxxxxxxxx>
Acked-by: Paul Moore <paul@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
include/net/cipso_ipv4.h | 4 ++++
net/ipv4/cipso_ipv4.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/include/net/cipso_ipv4.h b/include/net/cipso_ipv4.h
index a8c2ef6d3b93..9078b31d336f 100644
--- a/include/net/cipso_ipv4.h
+++ b/include/net/cipso_ipv4.h
@@ -303,6 +303,10 @@ static inline int cipso_v4_validate(const struct sk_buff *skb,
}
for (opt_iter = 6; opt_iter < opt_len;) {
+ if (opt_iter + 1 == opt_len) {
+ err_offset = opt_iter;
+ goto out;
+ }
tag_len = opt[opt_iter + 1];
if ((tag_len == 0) || (opt[opt_iter + 1] > (opt_len - opt_iter))) {
err_offset = opt_iter + 1;
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 667c1d4ca984..4322372dddbe 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1649,6 +1649,10 @@ 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;
--
2.12.0