fix signed/unsigned mismatch

diff --git a/sapi/cgi/cgi_main.c b/sapi/cgi/cgi_main.c
index dead1c3213968033a90509dbfe0599a890836510..f06787543e470c688d84ddbafc555671f0f3fd52 100644 (file)
--- a/sapi/cgi/cgi_main.c
+++ b/sapi/cgi/cgi_main.c
@@ -509,8 +509,13 @@ static size_t sapi_cgi_read_post(char *buffer, size_t count_bytes TSRMLS_DC)
 {
        size_t read_bytes = 0;
        int tmp_read_bytes;
+       size_t remaining_bytes;
 
-       count_bytes = MIN(count_bytes, SG(request_info).content_length - SG(read_post_bytes));
+       assert(SG(request_info).content_length >= SG(read_post_bytes));
+
+       remaining_bytes = (size_t)(SG(request_info).content_length - SG(read_post_bytes));
+
+       count_bytes = MIN(count_bytes, remaining_bytes);
        while (read_bytes < count_bytes) {
                tmp_read_bytes = read(STDIN_FILENO, buffer + read_bytes, count_bytes - read_bytes);
                if (tmp_read_bytes <= 0) {