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-rw-r--r--crypto/openssl/crypto/stack/stack.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/crypto/openssl/crypto/stack/stack.h b/crypto/openssl/crypto/stack/stack.h
index 0f825cc..a615d9b 100644
--- a/crypto/openssl/crypto/stack/stack.h
+++ b/crypto/openssl/crypto/stack/stack.h
@@ -76,8 +76,8 @@ typedef struct stack_st
#define sk_new_null() sk_new(NULL)
-#define M_sk_num(sk) ((sk)->num)
-#define M_sk_value(sk,n) ((sk)->data[n])
+#define M_sk_num(sk) ((sk) ? (sk)->num:-1)
+#define M_sk_value(sk,n) ((sk) ? (sk)->data[n] : NULL)
int sk_num(STACK *);
char *sk_value(STACK *, int);
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