hdr_delta is unsigned, so take care not to subtract below 0.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 7bc9929..b1d862b 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1999,7 +1999,11 @@ void cipso_v4_sock_delattr(struct sock *sk)
iter++;
hdr_delta = opt->optlen;
opt->optlen = (optlen_new + 3) & ~3;
- hdr_delta -= opt->optlen;
+
+ if (hdr_delta > opt->optlen)
+ hdr_delta -= opt->optlen;
+ else
+ hdr_delta = 0;
} else {
/* only the cipso option was present on the socket so we can
* remove the entire option struct */
--
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