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| author | darrenr <darrenr@FreeBSD.org> | 2000-05-09 23:35:24 +0000 |
|---|---|---|
| committer | darrenr <darrenr@FreeBSD.org> | 2000-05-09 23:35:24 +0000 |
| commit | 4e731bbb1b9153f6c20b7f97e0a3c29d5a9fc1b5 (patch) | |
| tree | 4f2e4f156fac8dd466e6f4409a584a86cd8c0188 /sys/contrib/ipfilter | |
| parent | dc13001fde15e358f09fdb416241118abc5e0985 (diff) | |
| download | FreeBSD-src-4e731bbb1b9153f6c20b7f97e0a3c29d5a9fc1b5.zip FreeBSD-src-4e731bbb1b9153f6c20b7f97e0a3c29d5a9fc1b5.tar.gz | |
Fix bug in dealing with "hlen == 1 and opt > 1"
Diffstat (limited to 'sys/contrib/ipfilter')
| -rw-r--r-- | sys/contrib/ipfilter/netinet/fil.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sys/contrib/ipfilter/netinet/fil.c b/sys/contrib/ipfilter/netinet/fil.c index 3a5444a..bb53f49 100644 --- a/sys/contrib/ipfilter/netinet/fil.c +++ b/sys/contrib/ipfilter/netinet/fil.c @@ -285,13 +285,19 @@ getports: } - for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen; ) { + for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) { opt = *s; if (opt == '\0') break; - ol = (opt == IPOPT_NOP) ? 1 : (int)*(s+1); - if (opt > 1 && (ol < 2 || ol > hlen)) - break; + else if (opt == IPOPT_NOP) + ol = 1; + else { + if (hlen < 2) + break; + ol = (int)*(s + 1); + if (ol < 2 || ol > hlen) + break; + } for (i = 9, mv = 4; mv >= 0; ) { op = ipopts + i; if (opt == (u_char)op->ol_val) { |
