BN_CTX-related fixes.

[openssl.git] / crypto / bn / bn_ctx.c

diff --git a/crypto/bn/bn_ctx.c b/crypto/bn/bn_ctx.c
index b1a8d7571e83a23389ea0c2c8d6c34d9df72b55a..28b334fbd56f55a5731e20bb590239ba2d8d0431 100644 (file)
--- a/crypto/bn/bn_ctx.c
+++ b/crypto/bn/bn_ctx.c
@@ -112,8 +112,14 @@ void BN_CTX_start(BN_CTX *ctx)
        ctx->depth++;
        }
 
+
 BIGNUM *BN_CTX_get(BN_CTX *ctx)
        {
+       /* Note: If BN_CTX_get is ever changed to allocate BIGNUMs dynamically,
+        * make sure that if BN_CTX_get fails once it will return NULL again
+        * until BN_CTX_end is called.  (This is so that callers have to check
+        * only the last return value.)
+        */
        if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM)
                {
                if (!ctx->too_many)