ossl-params: check length returned by strlen()

In param_build.c, the functions OSSL_PARAM_BLD_push_utf8_string() and
OSSL_PARAM_BLD_push_utf8_ptr() use strlen() to compute the length of
the string when bsize is zero.  However, the size_t returned by
strlen() might be too large (it is stored in an intermediate "int"),
so check for that.

There are analogous functions in params.c, but they do not use an
intermediate "int" to store the size_t returned by strlen().  So there
is some inconsistency between the implementations.

Credit to Viktor D and Tomas M for spotting these missing checks.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22967)

diff --git a/crypto/param_build.c b/crypto/param_build.c
index 2392e5909cf43c68901f941eaab81d3db89d8fa5..799094da9bd547e3c48854d3cd5c40a0d7291360 100644 (file)
--- a/crypto/param_build.c
+++ b/crypto/param_build.c
@@ -255,9 +255,9 @@ int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
     OSSL_PARAM_BLD_DEF *pd;
     int secure;
 
-    if (bsize == 0) {
+    if (bsize == 0)
         bsize = strlen(buf);
-    } else if (bsize > INT_MAX) {
+    if (bsize > INT_MAX) {
         ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_STRING_TOO_LONG);
         return 0;
     }
@@ -274,9 +274,9 @@ int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
 {
     OSSL_PARAM_BLD_DEF *pd;
 
-    if (bsize == 0) {
+    if (bsize == 0)
         bsize = strlen(buf);
-    } else if (bsize > INT_MAX) {
+    if (bsize > INT_MAX) {
         ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_STRING_TOO_LONG);
         return 0;
     }