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Check return-code of inet_pton when parsing DHCPv4 options.

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This commit is contained in:
Simon Kelley
2016-04-21 22:34:22 +01:00
parent a7b27e84fa
commit a2bc254bed
2 changed files with 9 additions and 3 deletions
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5
CHANGELOG
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@@ -56,6 +56,11 @@ version 2.76
Add --tftp-mtu option. Thanks to Patrick McLean for the
initial patch.
Check return-code of inet_pton() when parsing dhcp-option.
Bad addresses could fail to generate errors and result in
garbage dhcp-options being sent. Thanks to Marc Branchaud
for spotting this.
version 2.75
Fix reversion on 2.74 which caused 100% CPU use when a

7
src/option.c
View File

@@ -1199,7 +1199,8 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
cp = comma;
comma = split(cp);
slash = split_chr(cp, '/');
inet_pton(AF_INET, cp, &in);
if (!inet_pton(AF_INET, cp, &in))
ret_err(_("bad IPv4 address"));
if (!slash)
{
memcpy(op, &in, INADDRSZ);
@@ -3658,8 +3659,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
(!(inet_pton(AF_INET, a[1], &new->out) > 0)))
option = '?';
if (k == 3)
inet_pton(AF_INET, a[2], &new->mask);
if (k == 3 && !inet_pton(AF_INET, a[2], &new->mask))
option = '?';
if (dash &&
(!(inet_pton(AF_INET, dash, &new->end) > 0) ||