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-rw-r--r--lib/security.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/security.c b/lib/security.c
index e9f8ea02f..c79128abd 100644
--- a/lib/security.c
+++ b/lib/security.c
@@ -180,11 +180,13 @@ static CURLcode read_data(struct connectdata *conn,
}
static size_t
-buffer_read(struct krb4buffer *buf, void *data, size_t len)
+buffer_read(struct krb4buffer *buf, const char *data, size_t len)
{
- if(buf->size - buf->index < len)
- len = buf->size - buf->index;
- memcpy(data, (char*)buf->data + buf->index, len);
+ size_t buf_capacity = buf->size - buf->index;
+ DEBUGASSERT(buf->size > buf->index);
+ if(buf_capacity < len)
+ len = buf_capacity;
+ memcpy(buf, data, len);
buf->index += len;
return len;
}