Return NULL from ossl_lib_ctx_get_concrete() when it is uninitialized

When default_context_inited is set to false we return NULL instead of
the global default context.

Fixes #25442

Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26319)

(cherry picked from commit dfce0d7418d6d5b54d74fa80fc50392f00270c53)

diff --git a/crypto/context.c b/crypto/context.c
index e6edaac51fe2863bdf9a98b200cb64183ecdcf54..7385192cd4665d66bb772da6fb8b801c37506f19 100644 (file)
--- a/crypto/context.c
+++ b/crypto/context.c
@@ -54,17 +54,23 @@ struct ossl_lib_ctx_st {
 
 int ossl_lib_ctx_write_lock(OSSL_LIB_CTX *ctx)
 {
-    return CRYPTO_THREAD_write_lock(ossl_lib_ctx_get_concrete(ctx)->lock);
+    if ((ctx = ossl_lib_ctx_get_concrete(ctx)) == NULL)
+        return 0;
+    return CRYPTO_THREAD_write_lock(ctx->lock);
 }
 
 int ossl_lib_ctx_read_lock(OSSL_LIB_CTX *ctx)
 {
-    return CRYPTO_THREAD_read_lock(ossl_lib_ctx_get_concrete(ctx)->lock);
+    if ((ctx = ossl_lib_ctx_get_concrete(ctx)) == NULL)
+        return 0;
+    return CRYPTO_THREAD_read_lock(ctx->lock);
 }
 
 int ossl_lib_ctx_unlock(OSSL_LIB_CTX *ctx)
 {
-    return CRYPTO_THREAD_unlock(ossl_lib_ctx_get_concrete(ctx)->lock);
+    if ((ctx = ossl_lib_ctx_get_concrete(ctx)) == NULL)
+        return 0;
+    return CRYPTO_THREAD_unlock(ctx->lock);
 }
 
 int ossl_lib_ctx_is_child(OSSL_LIB_CTX *ctx)
@@ -410,7 +416,7 @@ static OSSL_LIB_CTX *get_default_context(void)
 {
     OSSL_LIB_CTX *current_defctx = get_thread_default_context();
 
-    if (current_defctx == NULL)
+    if (current_defctx == NULL && default_context_inited)
         current_defctx = &default_context_int;
     return current_defctx;
 }

diff --git a/crypto/rand/rand_lib.c b/crypto/rand/rand_lib.c
index 14999540abc2938d7428cacdfeeaaf67b6bfb039..7787aad47e4f735843a311ed0df81c02ad8b5ff5 100644 (file)
--- a/crypto/rand/rand_lib.c
+++ b/crypto/rand/rand_lib.c
@@ -767,6 +767,9 @@ EVP_RAND_CTX *RAND_get0_public(OSSL_LIB_CTX *ctx)
             return NULL;
 
         ctx = ossl_lib_ctx_get_concrete(ctx);
+
+        if (ctx == NULL)
+            return NULL;
         /*
          * If the private is also NULL then this is the first time we've
          * used this thread.
@@ -800,6 +803,9 @@ EVP_RAND_CTX *RAND_get0_private(OSSL_LIB_CTX *ctx)
             return NULL;
 
         ctx = ossl_lib_ctx_get_concrete(ctx);
+
+        if (ctx == NULL)
+            return NULL;
         /*
          * If the public is also NULL then this is the first time we've
          * used this thread.