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boundary checking for print_nsap()

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hannes 2002-09-01 21:08:02 +00:00
parent 3a93c1943b
commit 92f6294b49
1 changed files with 17 additions and 16 deletions
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33
print-isoclns.c
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@ -26,7 +26,7 @@
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.58 2002-08-20 00:17:23 hannes Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.59 2002-09-01 21:08:02 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -433,28 +433,29 @@ struct isis_tlv_lsp {
* xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx
* 32 bytes plus one termination byte */
static char *
print_nsap(register const u_char *cp, register int length)
print_nsap(register const u_char *pptr, register int nsap_length)
{
int i;
static char nsap[33];
char *pos = nsap;
int nsap_idx;
static char nsap_ascii_output[33];
char *junk_buf = nsap_ascii_output;
if (length==0) {
*(pos) = '0';
*(pos+1) = '\0';
return (nsap);
if (nsap_length < 1 || nsap_length > 13) {
junk_buf+=sprintf(junk_buf, "illegal length");
*(junk_buf) = '\0';
return (nsap_ascii_output);
}
for (i = 0; i < length; i++) {
if (!TTEST2(*cp, 1))
for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
if (!TTEST2(*pptr, 1))
return (0);
pos+=sprintf(pos, "%02x", *cp++);
if (((i & 1) == 0) && (i + 1 < length)) {
pos+=sprintf(pos, ".");
junk_buf+=sprintf(junk_buf, "%02x", *pptr++);
if (((nsap_idx & 1) == 0) &&
(nsap_idx + 1 < nsap_length)) {
junk_buf+=sprintf(junk_buf, ".");
}
}
*(pos) = '\0';
return (nsap);
*(junk_buf) = '\0';
return (nsap_ascii_output);
}
#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))