[nginx] Core: fixed potential division by zero when initializing...

[Sergey Kandaurov]

details:   http://hg.nginx.org/nginx/rev/3b6d69857de2
branches:  
changeset: 6225:3b6d69857de2
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Thu Aug 13 16:27:17 2015 +0300
description:
Core: fixed potential division by zero when initializing hash.

Found by Clang Static Analyzer.

diffstat:

 src/core/ngx_hash.c |  8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diffs (18 lines):

diff -r ddf35e019a80 -r 3b6d69857de2 src/core/ngx_hash.c
--- a/src/core/ngx_hash.c	Thu Aug 13 16:27:13 2015 +0300
+++ b/src/core/ngx_hash.c	Thu Aug 13 16:27:17 2015 +0300
@@ -257,6 +257,14 @@ ngx_hash_init(ngx_hash_init_t *hinit, ng
     ngx_uint_t       i, n, key, size, start, bucket_size;
     ngx_hash_elt_t  *elt, **buckets;
 
+    if (hinit->max_size == 0) {
+        ngx_log_error(NGX_LOG_EMERG, hinit->pool->log, 0,
+                      "could not build %s, you should "
+                      "increase %s_max_size: %i",
+                      hinit->name, hinit->name, hinit->max_size);
+        return NGX_ERROR;
+    }
+
     for (n = 0; n < nelts; n++) {
         if (hinit->bucket_size < NGX_HASH_ELT_SIZE(&names[n]) + sizeof(void *))
         {