commit 363a0c53e755750346113d9c5c9cb1a2905d2d2d
author Valentin Bartenev <vbart@nginx.com> Mon Jan 16 12:42:07 2012 +0000
committer Valentin Bartenev <vbart@nginx.com> Mon Jan 16 12:42:07 2012 +0000
tree 9add4528a42de86050b9d88adb675c89efb3afd3
parent b904676b5e687c8aeabcce297aa6250e07e63462

Fixed division by zero exception in ngx_hash_init().

The ngx_hash_init() function did not expect call with zero elements count,
which caused FPE error on configs with an empty "types" block in http context
and "types_hash_max_size" > 10000.

Example configuration to reproduce:

  events { }

  http {
          types_hash_max_size 10001;
          types {}
          server {}
  }

src/core/ngx_hash.c

diff --git a/src/core/ngx_hash.c b/src/core/ngx_hash.c
index 0c72852..74d89b8 100644
--- a/src/core/ngx_hash.c
+++ b/src/core/ngx_hash.c
@@ -277,7 +277,7 @@
     start = nelts / (bucket_size / (2 * sizeof(void *)));
     start = start ? start : 1;
 
-    if (hinit->max_size > 10000 && hinit->max_size / nelts < 100) {
+    if (hinit->max_size > 10000 && nelts && hinit->max_size / nelts < 100) {
         start = hinit->max_size - 1000;
     }