From db835f8c40e83c6392e69ffc7f2cc500f7682dd4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
Date: Fri, 3 Sep 2021 19:23:20 +0200
Subject: [PATCH 10/15] Fix coverity detected issues in option.c
Error: STRING_OVERFLOW (CWE-120): [#def99]
dnsmasq-2.86test7/src/option.c:801: fixed_size_dest: You might overrun the 100-character fixed-size string "buff" by copying "usage[i].arg" without checking the length.
# 799| if (usage[i].arg)
# 800| {
# 801|-> strcpy(buff, usage[i].arg);
# 802| for (j = 0; tab[j].handle; j++)
# 803| if (tab[j].handle == *(usage[i].arg))
Error: CLANG_WARNING: [#def100]
dnsmasq-2.86test7/src/option.c:962:3: warning[deadcode.DeadStores]: Value stored to 'domain' is never read
# 960| }
# 961|
# 962|-> domain += sprintf(domain, "in-addr.arpa");
# 963|
# 964| return 1;
Error: CLANG_WARNING: [#def101]
dnsmasq-2.86test7/src/option.c:981:3: warning[deadcode.DeadStores]: Value stored to 'domain' is never read
# 979| domain += sprintf(domain, "%.1x.", (i>>2) & 1 ? dig & 15 : dig >> 4);
# 980| }
# 981|-> domain += sprintf(domain, "ip6.arpa");
# 982|
# 983| return 1;
Error: RESOURCE_LEAK (CWE-772): [#def102] [important]
dnsmasq-2.86test7/src/option.c:1809: alloc_fn: Storage is returned from allocation function "opt_malloc".
dnsmasq-2.86test7/src/option.c:1809: var_assign: Assigning: "path" = storage returned from "opt_malloc(strlen(directory) + len + 2UL)".
dnsmasq-2.86test7/src/option.c:1810: noescape: Resource "path" is not freed or pointed-to in "strcpy". [Note: The source code implementation of the function has been overridden by a builtin model.]
dnsmasq-2.86test7/src/option.c:1811: noescape: Resource "path" is not freed or pointed-to in "strcat". [Note: The source code implementation of the function has been overridden by a builtin model.]
dnsmasq-2.86test7/src/option.c:1812: noescape: Resource "path" is not freed or pointed-to in "strcat". [Note: The source code implementation of the function has been overridden by a builtin model.]
dnsmasq-2.86test7/src/option.c:1815: noescape: Resource "path" is not freed or pointed-to in "stat".
dnsmasq-2.86test7/src/option.c:1809: overwrite_var: Overwriting "path" in "path = opt_malloc(strlen(directory) + len + 2UL)" leaks the storage that "path" points to.
# 1807| continue;
# 1808|
# 1809|-> path = opt_malloc(strlen(directory) + len + 2);
# 1810| strcpy(path, directory);
# 1811| strcat(path, "/");
Error: RESOURCE_LEAK (CWE-772): [#def103] [important]
dnsmasq-2.86test7/src/option.c:1809: alloc_fn: Storage is returned from allocation function "opt_malloc".
dnsmasq-2.86test7/src/option.c:1809: var_assign: Assigning: "path" = storage returned from "opt_malloc(strlen(directory) + len + 2UL)".
dnsmasq-2.86test7/src/option.c:1810: noescape: Resource "path" is not freed or pointed-to in "strcpy". [Note: The source code implementation of the function has been overridden by a builtin model.]
dnsmasq-2.86test7/src/option.c:1811: noescape: Resource "path" is not freed or pointed-to in "strcat". [Note: The source code implementation of the function has been overridden by a builtin model.]
dnsmasq-2.86test7/src/option.c:1812: noescape: Resource "path" is not freed or pointed-to in "strcat". [Note: The source code implementation of the function has been overridden by a builtin model.]
dnsmasq-2.86test7/src/option.c:1815: noescape: Resource "path" is not freed or pointed-to in "stat".
dnsmasq-2.86test7/src/option.c:1858: leaked_storage: Variable "path" going out of scope leaks the storage it points to.
# 1856| free(files);
# 1857| }
# 1858|-> break;
# 1859| }
# 1860|
Error: RESOURCE_LEAK (CWE-772): [#def104] [important]
dnsmasq-2.86test7/src/option.c:1996: alloc_fn: Storage is returned from allocation function "canonicalise_opt".
dnsmasq-2.86test7/src/option.c:1996: var_assign: Assigning: "name" = storage returned from "canonicalise_opt(arg)".
dnsmasq-2.86test7/src/option.c:1998: leaked_storage: Variable "name" going out of scope leaks the storage it points to.
# 1996| if (!(name = canonicalise_opt(arg)) ||
# 1997| (comma && !(target = canonicalise_opt(comma))))
# 1998|-> ret_err(_("bad MX name"));
# 1999|
# 2000| new = opt_malloc(sizeof(struct mx_srv_record));
Error: RESOURCE_LEAK (CWE-772): [#def106] [important]
dnsmasq-2.86test7/src/option.c:3477: alloc_fn: Storage is returned from allocation function "opt_malloc".
dnsmasq-2.86test7/src/option.c:3477: var_assign: Assigning: "new" = storage returned from "opt_malloc(96UL)".
dnsmasq-2.86test7/src/option.c:3618: leaked_storage: Variable "new" going out of scope leaks the storage it points to.
# 3616| sprintf(errstr, _("duplicate dhcp-host IP address %s"),
# 3617| daemon->addrbuff);
# 3618|-> return 0;
# 3619| }
# 3620| }
Error: RESOURCE_LEAK (CWE-772): [#def108] [important]
dnsmasq-2.86test7/src/option.c:3781: alloc_fn: Storage is returned from allocation function "opt_malloc".
dnsmasq-2.86test7/src/option.c:3781: var_assign: Assigning: "new" = storage returned from "opt_malloc(32UL)".
dnsmasq-2.86test7/src/option.c:3786: leaked_storage: Variable "new" going out of scope leaks the storage it points to.
# 3784|
# 3785| if (!(comma = split(arg)) || (len = strlen(comma)) == 0)
# 3786|-> ret_err(gen_err);
# 3787|
# 3788| new->wildcard = 0;
Error: RESOURCE_LEAK (CWE-772): [#def109] [important]
dnsmasq-2.86test7/src/option.c:3921: alloc_fn: Storage is returned from allocation function "opt_malloc".
dnsmasq-2.86test7/src/option.c:3921: var_assign: Assigning: "new" = storage returned from "opt_malloc(56UL)".
dnsmasq-2.86test7/src/option.c:3994: leaked_storage: Variable "new" going out of scope leaks the storage it points to.
# 3992| }
# 3993|
# 3994|-> ret_err(gen_err);
# 3995| }
# 3996|
Error: CLANG_WARNING: [#def111]
dnsmasq-2.86test7/src/option.c:4693:25: warning[deadcode.DeadStores]: Value stored to 'tmp' during its initialization is never read
# 4691| if (!canon)
# 4692| {
# 4693|-> struct name_list *tmp = new->names, *next;
# 4694| for (tmp = new->names; tmp; tmp = next)
# 4695|
---
src/option.c | 33 +++++++++++++++++++++------------
1 file changed, 21 insertions(+), 12 deletions(-)
diff --git a/src/option.c b/src/option.c
index ffce9fc..11655fd 100644
--- a/src/option.c
+++ b/src/option.c
@@ -798,7 +798,7 @@ static void do_usage(void)
if (usage[i].arg)
{
- strcpy(buff, usage[i].arg);
+ safe_strncpy(buff, usage[i].arg, sizeof(buff));
for (j = 0; tab[j].handle; j++)
if (tab[j].handle == *(usage[i].arg))
sprintf(buff, "%d", tab[j].val);
@@ -959,7 +959,7 @@ static int domain_rev4(char *domain, struct in_addr addr, int msize)
return 0;
}
- domain += sprintf(domain, "in-addr.arpa");
+ sprintf(domain, "in-addr.arpa");
return 1;
}
@@ -978,7 +978,7 @@ static int domain_rev6(char *domain, struct in6_addr *addr, int msize)
int dig = ((unsigned char *)addr)[i>>3];
domain += sprintf(domain, "%.1x.", (i>>2) & 1 ? dig & 15 : dig >> 4);
}
- domain += sprintf(domain, "ip6.arpa");
+ sprintf(domain, "ip6.arpa");
return 1;
}
@@ -1829,6 +1829,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
new->next = li;
*up = new;
}
+ else
+ free(path);
}
@@ -1995,7 +1997,11 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
if (!(name = canonicalise_opt(arg)) ||
(comma && !(target = canonicalise_opt(comma))))
- ret_err(_("bad MX name"));
+ {
+ free(name);
+ free(target);
+ ret_err(_("bad MX name"));
+ }
new = opt_malloc(sizeof(struct mx_srv_record));
new->next = daemon->mxnames;
@@ -3616,6 +3622,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
inet_ntop(AF_INET, &in, daemon->addrbuff, ADDRSTRLEN);
sprintf(errstr, _("duplicate dhcp-host IP address %s"),
daemon->addrbuff);
+ dhcp_config_free(new);
return 0;
}
}
@@ -3779,16 +3786,16 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
case LOPT_NAME_MATCH: /* --dhcp-name-match */
{
- struct dhcp_match_name *new = opt_malloc(sizeof(struct dhcp_match_name));
- struct dhcp_netid *id = opt_malloc(sizeof(struct dhcp_netid));
+ struct dhcp_match_name *new;
ssize_t len;
if (!(comma = split(arg)) || (len = strlen(comma)) == 0)
ret_err(gen_err);
+ new = opt_malloc(sizeof(struct dhcp_match_name));
new->wildcard = 0;
- new->netid = id;
- id->net = opt_string_alloc(set_prefix(arg));
+ new->netid = opt_malloc(sizeof(struct dhcp_netid));
+ new->netid->net = opt_string_alloc(set_prefix(arg));
if (comma[len-1] == '*')
{
@@ -3992,6 +3999,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
}
}
+ dhcp_netid_free(new->netid);
+ free(new);
ret_err(gen_err);
}
@@ -4367,7 +4376,7 @@ err:
case LOPT_CNAME: /* --cname */
{
struct cname *new;
- char *alias, *target, *last, *pen;
+ char *alias, *target=NULL, *last, *pen;
int ttl = -1;
for (last = pen = NULL, comma = arg; comma; comma = split(comma))
@@ -4382,13 +4391,13 @@ err:
if (pen != arg && atoi_check(last, &ttl))
last = pen;
- target = canonicalise_opt(last);
-
while (arg != last)
{
int arglen = strlen(arg);
alias = canonicalise_opt(arg);
+ if (!target)
+ target = canonicalise_opt(last);
if (!alias || !target)
{
free(target);
@@ -4691,7 +4700,7 @@ err:
struct name_list *nl;
if (!canon)
{
- struct name_list *tmp = new->names, *next;
+ struct name_list *tmp, *next;
for (tmp = new->names; tmp; tmp = next)
{
next = tmp->next;
--
2.31.1