[NETFILTER]: nf_conntrack_sip: fix some off-by-ones

"limit" marks the first character outside the bounds.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 0021d5b60cecb886a2f7d4e491b0ce749ea8b363..016e1c1aafe44a58ebeea68c41d31f6a60a4f10f 100644 (file)
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -192,10 +192,10 @@ int ct_sip_lnlen(const char *line, const char *limit)
 {
        const char *k = line;
 
-       while ((line <= limit) && (*line == '\r' || *line == '\n'))
+       while ((line < limit) && (*line == '\r' || *line == '\n'))
                line++;
 
-       while (line <= limit) {
+       while (line < limit) {
                if (*line == '\r' || *line == '\n')
                        break;
                line++;
@@ -211,7 +211,7 @@ const char *ct_sip_search(const char *needle, const char *haystack,
 {
        const char *limit = haystack + (haystack_len - needle_len);
 
-       while (haystack <= limit) {
+       while (haystack < limit) {
                if (case_sensitive) {
                        if (strncmp(haystack, needle, needle_len) == 0)
                                return haystack;
@@ -229,7 +229,7 @@ static int digits_len(const struct nf_conn *ct, const char *dptr,
                      const char *limit, int *shift)
 {
        int len = 0;
-       while (dptr <= limit && isdigit(*dptr)) {
+       while (dptr < limit && isdigit(*dptr)) {
                dptr++;
                len++;
        }
@@ -240,7 +240,7 @@ static int digits_len(const struct nf_conn *ct, const char *dptr,
 static int skp_digits_len(const struct nf_conn *ct, const char *dptr,
                          const char *limit, int *shift)
 {
-       for (; dptr <= limit && *dptr == ' '; dptr++)
+       for (; dptr < limit && *dptr == ' '; dptr++)
                (*shift)++;
 
        return digits_len(ct, dptr, limit, shift);
@@ -302,13 +302,13 @@ static int skp_epaddr_len(const struct nf_conn *ct, const char *dptr,
        /* Search for @, but stop at the end of the line.
         * We are inside a sip: URI, so we don't need to worry about
         * continuation lines. */
-       while (dptr <= limit &&
+       while (dptr < limit &&
               *dptr != '@' && *dptr != '\r' && *dptr != '\n') {
                (*shift)++;
                dptr++;
        }
 
-       if (dptr <= limit && *dptr == '@') {
+       if (dptr < limit && *dptr == '@') {
                dptr++;
                (*shift)++;
        } else {
@@ -332,7 +332,7 @@ int ct_sip_get_info(const struct nf_conn *ct,
 
        limit = dptr + (dlen - hnfo->lnlen);
 
-       while (dptr <= limit) {
+       while (dptr < limit) {
                if ((strncmp(dptr, hnfo->lname, hnfo->lnlen) != 0) &&
                    (hnfo->sname == NULL ||
                     strncmp(dptr, hnfo->sname, hnfo->snlen) != 0)) {