commit e86279e9f3d06ef50c518551eb6c7aea9d0bd41d
author Valentin Bartenev <vbart@nginx.com> Fri Dec 14 15:17:58 2012 +0000
committer Valentin Bartenev <vbart@nginx.com> Fri Dec 14 15:17:58 2012 +0000
tree 7572d21dc22e07ae99ff2dc899ea0bdd8cc87d3f
parent 658296290cc1be3739f0092d5afe719df5a88d82

Gzip: fixed zlib memLevel adjusting.

An incorrect memLevel (lower than 1) might be passed to deflateInit2() if the
"gzip_hash" directive is set to a value less than the value of "gzip_window"
directive. This resulted in "deflateInit2() failed: -2" alert and an empty
reply.

src/http/modules/ngx_http_gzip_filter_module.c

diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
index 09994d9..470be3d 100644
--- a/src/http/modules/ngx_http_gzip_filter_module.c
+++ b/src/http/modules/ngx_http_gzip_filter_module.c
@@ -498,6 +498,10 @@
             wbits--;
             memlevel--;
         }
+
+        if (memlevel < 1) {
+            memlevel = 1;
+        }
     }
 
     ctx->wbits = wbits;