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Fix libpcap issue #893: check for invalid IPv4 addresses.

Browse Source 
This fixes errors such as:

tcpdump -i lagg0 net 999.999.999.999

This was originally discovered on a Red Hat 7.7 server and verified
to also be a bug on FreeBSD.

Obtained from:	https://github.com/the-tcpdump-group/libpcap/commit/ \
		07070918d5e81a515315b395f334e52589fe0fb
Fixed by:	https://github.com/guyharris
This commit is contained in:
Cy Schubert 2019-12-19 00:11:18 +00:00
parent 30a580a870
commit 20616273d5
2 changed files with 16 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
gencode.c
View File

@ -6955,11 +6955,15 @@ gen_mcode(compiler_state_t *cstate, const char *s1, const char *s2,
return (NULL);
nlen = __pcap_atoin(s1, &n);
if (nlen < 0)
bpf_error(cstate, "invalid IPv4 address '%s'", s1);
/* Promote short ipaddr */
n <<= 32 - nlen;
if (s2 != NULL) {
mlen = __pcap_atoin(s2, &m);
if (mlen < 0)
bpf_error(cstate, "invalid IPv4 address '%s'", s2);
/* Promote short ipaddr */
m <<= 32 - mlen;
if ((n & ~m) != 0)
@ -7017,8 +7021,11 @@ gen_ncode(compiler_state_t *cstate, const char *s, bpf_u_int32 v, struct qual q)
vlen = __pcap_atodn(s, &v);
if (vlen == 0)
bpf_error(cstate, "malformed decnet address '%s'", s);
} else
} else {
vlen = __pcap_atoin(s, &v);
if (vlen < 0)
bpf_error(cstate, "invalid IPv4 address '%s'", s);
}
switch (q.addr) {

9
nametoaddr.c
View File

@ -653,8 +653,15 @@ __pcap_atoin(const char *s, bpf_u_int32 *addr)
len = 0;
for (;;) {
n = 0;
while (*s && *s != '.')
while (*s && *s != '.') {
if (n > 25) {
/* The result will be > 255 */
return -1;
}
n = n * 10 + *s++ - '0';
}
if (n > 255)
return -1;
*addr <<= 8;
*addr |= n & 0xff;
len += 8;