PenTest/nmap
1
0
Fork 0
mirror of https://github.com/nmap/nmap.git synced 2025-12-15 20:29:03 +00:00
Code Issues Projects Releases Wiki Activity

Avoid warnings about signedness in comparisons. See 2150

Browse Source
This commit is contained in:
dmiller
2020-10-15 17:45:48 +00:00
parent f48d12a591
commit 3c5b7107d5
1 changed files with 4 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
tcpip.cc
View File

@@ -1284,7 +1284,7 @@ int readudppacket(const u8 *packet, int readdata) {
The options checked are MSS, WScale, SackOK, Sack, and Timestamp. */
static bool validateTCPhdr(const u8 *tcpc, unsigned len) {
struct tcp_hdr *tcp = (struct tcp_hdr *) tcpc;
int hdrlen, optlen;
unsigned hdrlen, optlen;
hdrlen = tcp->th_off * 4;
@@ -1296,6 +1296,7 @@ static bool validateTCPhdr(const u8 *tcpc, unsigned len) {
tcpc += sizeof(struct tcp_hdr);
optlen = hdrlen - sizeof(struct tcp_hdr);
// This macro guarantees optlen does not underflow by returning if optlen < expected
#define OPTLEN_IS(expected) do { \
if ((expected) == 0 || optlen < (expected) || hdrlen != (expected)) \
return false; \
@@ -1347,10 +1348,8 @@ static bool validateTCPhdr(const u8 *tcpc, unsigned len) {
// Only 1 byte left in options, this has to be NOP or EOL
return (*tcpc == 0 || *tcpc == 1);
}
else if (optlen < 0) {
// Last option claimed to be longer than options list
return false;
}
// There is no way out of the previous loop that does not satisfy optlen == 0 or optlen == 1
assert(optlen == 0);
return true;
}