common-lib: Use wrapper for string to integer conversion

In order to detect an value overflow error during
the string to integer conversion with strtoul/strtoull,
the errno variable must be set to zero before the execution and
checked after the conversion is performed. This is achieved by
using the wrapper function strtoul_err and strtoull_err.

Signed-off-by: Swen Schillig <swen@linux.ibm.com>
Reviewed-by: Ralph Böhme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

6 files changed, 65 insertions, 23 deletions

diff --git a/lib/ldb-samba/ldb_matching_rules.c b/lib/ldb-samba/ldb_matching_rules.c
index 2aaaeb7450b..7387c12f10d 100644
--- a/lib/ldb-samba/ldb_matching_rules.c
+++ b/lib/ldb-samba/ldb_matching_rules.c
@@ -383,16 +383,22 @@ static int dsdb_match_for_dns_to_tombstone_time(struct ldb_context *ldb,
 		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 	} else {
 		char *p = NULL;
+		int error = 0;
 		char s[value_to_match->length+1];
+
 		memcpy(s, value_to_match->data, value_to_match->length);
 		s[value_to_match->length] = 0;
 		if (s[0] == '\0' || s[0] == '-') {
 			DBG_ERR("Empty timestamp passed\n");
 			return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 		}
-		tombstone_time = strtoull(s, &p, 10);
-		if (p == NULL || p == s || *p != '\0' ||
-		    tombstone_time == ULLONG_MAX) {
+		tombstone_time = strtoull_err(s, &p, 10, &error);
+		if (p == NULL ||
+		    p == s ||
+		    *p != '\0' ||
+		    error != 0 ||
+		    tombstone_time == ULLONG_MAX)
+		{
 			DBG_ERR("Invalid timestamp string passed\n");
 			return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 		}
@@ -514,14 +520,21 @@ static int dsdb_match_for_expunge(struct ldb_context *ldb,
 		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 	} else {
 		char *p = NULL;
+		int error = 0;
 		char s[value_to_match->length+1];
+
 		memcpy(s, value_to_match->data, value_to_match->length);
 		s[value_to_match->length] = 0;
 		if (s[0] == '\0' || s[0] == '-') {
 			return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 		}
-		tombstone_time = strtoull(s, &p, 10);
-		if (p == NULL || p == s || *p != '\0' || tombstone_time == ULLONG_MAX) {
+		tombstone_time = strtoull_err(s, &p, 10, &error);
+		if (p == NULL ||
+		    p == s ||
+		    *p != '\0' ||
+		    error != 0 ||
+		    tombstone_time == ULLONG_MAX)
+		{
 			return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
 		}
 	}
diff --git a/lib/ldb-samba/ldif_handlers.c b/lib/ldb-samba/ldif_handlers.c
index ecc02e51c1d..d38cdd0c9a3 100644
--- a/lib/ldb-samba/ldif_handlers.c
+++ b/lib/ldb-samba/ldif_handlers.c
@@ -596,6 +596,8 @@ static int ldif_read_prefixMap(struct ldb_context *ldb, void *mem_ctx,
 
 	line = string;
 	while (line && line[0]) {
+		int error = 0;
+
 		p=strchr(line, ';');
 		if (p) {
 			p[0] = '\0';
@@ -619,9 +621,10 @@ static int ldif_read_prefixMap(struct ldb_context *ldb, void *mem_ctx,
 			return -1;
 		}
 
-		blob->ctr.dsdb.mappings[blob->ctr.dsdb.num_mappings].id_prefix = strtoul(line, &oid, 10);
+		blob->ctr.dsdb.mappings[blob->ctr.dsdb.num_mappings].id_prefix =
+			strtoul_err(line, &oid, 10, &error);
 
-		if (oid[0] != ':') {
+		if (oid[0] != ':' || error != 0) {
 			talloc_free(tmp_ctx);
 			return -1;
 		}
diff --git a/lib/param/loadparm.c b/lib/param/loadparm.c
index 84c83ae91ec..9c7bf892835 100644
--- a/lib/param/loadparm.c
+++ b/lib/param/loadparm.c
@@ -331,13 +331,21 @@ int lp_int(const char *s)
  */
 unsigned long lp_ulong(const char *s)
 {
+	int error = 0;
+	unsigned long int ret;
 
 	if (!s || !*s) {
-		DEBUG(0,("lp_ulong(%s): is called with NULL!\n",s));
+		DBG_DEBUG("lp_ulong(%s): is called with NULL!\n",s);
 		return -1;
 	}
 
-	return strtoul(s, NULL, 0);
+	ret = strtoul_err(s, NULL, 0, &error);
+	if (error != 0) {
+		DBG_DEBUG("lp_ulong(%s): conversion failed\n",s);
+		return -1;
+	}
+
+	return ret;
 }
 
 /**
@@ -345,13 +353,21 @@ unsigned long lp_ulong(const char *s)
  */
 unsigned long long lp_ulonglong(const char *s)
 {
+	int error = 0;
+	unsigned long long int ret;
 
 	if (!s || !*s) {
-		DEBUG(0, ("lp_ulonglong(%s): is called with NULL!\n", s));
+		DBG_DEBUG("lp_ulonglong(%s): is called with NULL!\n", s);
 		return -1;
 	}
 
-	return strtoull(s, NULL, 0);
+	ret = strtoull_err(s, NULL, 0, &error);
+	if (error != 0) {
+		DBG_DEBUG("lp_ulonglong(%s): conversion failed\n",s);
+		return -1;
+	}
+
+	return ret;
 }
 
 /**
diff --git a/lib/util/access.c b/lib/util/access.c
index 7da0573a74d..a05a47c15b2 100644
--- a/lib/util/access.c
+++ b/lib/util/access.c
@@ -71,8 +71,11 @@ static bool masked_match(const char *tok, const char *slash, const char *s)
 		}
         } else {
 		char *endp = NULL;
-		unsigned long val = strtoul(slash+1, &endp, 0);
-		if (slash+1 == endp || (endp && *endp != '\0')) {
+		int error = 0;
+		unsigned long val;
+
+		val = strtoul_err(slash+1, &endp, 0, &error);
+		if (slash+1 == endp || (endp && *endp != '\0') || error != 0) {
 			return false;
 		}
 		if (!make_netmask(&ss_mask, &ss_tok, val)) {
diff --git a/lib/util/asn1.c b/lib/util/asn1.c
index 60ddfa09bcf..affa8f1df91 100644
--- a/lib/util/asn1.c
+++ b/lib/util/asn1.c
@@ -273,15 +273,20 @@ bool ber_write_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, const char *OID)
 	const char *p = (const char *)OID;
 	char *newp;
 	int i;
+	int error = 0;
 
 	if (!isdigit(*p)) return false;
-	v = strtoul(p, &newp, 10);
-	if (newp[0] != '.') return false;
+	v = strtoul_err(p, &newp, 10, &error);
+	if (newp[0] != '.' || error != 0) {
+		return false;
+	}
 	p = newp + 1;
 
 	if (!isdigit(*p)) return false;
-	v2 = strtoul(p, &newp, 10);
-	if (newp[0] != '.') return false;
+	v2 = strtoul_err(p, &newp, 10, &error);
+	if (newp[0] != '.' || error != 0) {
+		return false;
+	}
 	p = newp + 1;
 
 	/*the ber representation can't use more space than the string one */
@@ -293,8 +298,8 @@ bool ber_write_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB *blob, const char *OID)
 	i = 1;
 	while (*p) {
 		if (!isdigit(*p)) return false;
-		v = strtoul(p, &newp, 10);
-		if (newp[0] == '.') {
+		v = strtoul_err(p, &newp, 10, &error);
+		if (newp[0] == '.' || error != 0) {
 			p = newp + 1;
 			/* check for empty last component */
 			if (!*p) return false;
diff --git a/lib/util/util_str.c b/lib/util/util_str.c
index c7d91ca3744..447919b087b 100644
--- a/lib/util/util_str.c
+++ b/lib/util/util_str.c
@@ -63,13 +63,14 @@ _PUBLIC_ bool conv_str_size_error(const char * str, uint64_t * val)
 {
 	char *		    end = NULL;
 	unsigned long long  lval;
+	int error = 0;
 
 	if (str == NULL || *str == '\0') {
 		return false;
 	}
 
-	lval = strtoull(str, &end, 10 /* base */);
-	if (end == NULL || end == str) {
+	lval = strtoull_err(str, &end, 10, &error);
+	if (end == NULL || end == str || error != 0) {
 		return false;
 	}
 
@@ -104,13 +105,14 @@ _PUBLIC_ bool conv_str_u64(const char * str, uint64_t * val)
 {
 	char *		    end = NULL;
 	unsigned long long  lval;
+	int error = 0;
 
 	if (str == NULL || *str == '\0') {
 		return false;
 	}
 
-	lval = strtoull(str, &end, 10 /* base */);
-	if (end == NULL || *end != '\0' || end == str) {
+	lval = strtoull_err(str, &end, 10, &error);
+	if (end == NULL || *end != '\0' || end == str || error != 0) {
 		return false;
 	}