replace strtol(3) usage with strtonum(3); idea/ok/tweaks tb@

1 files changed, 10 insertions, 23 deletions

diff --git a/src/lib/libcrypto/dsa/dsa_pmeth.c b/src/lib/libcrypto/dsa/dsa_pmeth.c
index 001bdec201..019bee68b2 100644
--- a/src/lib/libcrypto/dsa/dsa_pmeth.c
+++ b/src/lib/libcrypto/dsa/dsa_pmeth.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: dsa_pmeth.c,v 1.19 2023/12/28 22:11:26 tb Exp $ */
+/* $OpenBSD: dsa_pmeth.c,v 1.20 2024/08/26 22:00:47 op Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2006.
  */
@@ -58,6 +58,7 @@
 
 #include <limits.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <openssl/asn1t.h>
@@ -244,34 +245,21 @@ pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 static int
 pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
 {
-        long lval;
-        char *ep;
+        const char *errstr;
 
         if (!strcmp(type, "dsa_paramgen_bits")) {
                 int nbits;
 
-                errno = 0;
-                lval = strtol(value, &ep, 10);
-                if (value[0] == '\0' || *ep != '\0')
-                        goto not_a_number;
-                if ((errno == ERANGE &&
-                    (lval == LONG_MAX || lval == LONG_MIN)) ||
-                    (lval > INT_MAX || lval < INT_MIN))
-                        goto out_of_range;
-                nbits = lval;
+                nbits = strtonum(value, INT_MIN, INT_MAX, &errstr);
+                if (errstr != NULL)
+                        return -2;
                 return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
         } else if (!strcmp(type, "dsa_paramgen_q_bits")) {
                 int qbits;
 
-                errno = 0;
-                lval = strtol(value, &ep, 10);
-                if (value[0] == '\0' || *ep != '\0')
-                        goto not_a_number;
-                if ((errno == ERANGE &&
-                    (lval == LONG_MAX || lval == LONG_MIN)) ||
-                    (lval > INT_MAX || lval < INT_MIN))
-                        goto out_of_range;
-                qbits = lval;
+                qbits = strtonum(value, INT_MIN, INT_MAX, &errstr);
+                if (errstr != NULL)
+                        return -2;
                 return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA,
                     EVP_PKEY_OP_PARAMGEN, EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS,
                     qbits, NULL);
@@ -280,8 +268,7 @@ pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
                     EVP_PKEY_OP_PARAMGEN, EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
                     (void *)EVP_get_digestbyname(value));
         }
-not_a_number:
-out_of_range:
+
         return -2;
 }