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Core: skip special buffers on writing (ticket #981). A special last buffer with cl->buf->pos set to NULL can be present in a chain when writing request body if chunked encoding was used. This resulted in a NULL pointer dereference if it happened to be the only buffer left after a do...while loop iteration in ngx_write_chain_to_file(). The problem originally appeared in nginx 1.3.9 with chunked encoding support. Additionally, rev. 3832b608dc8d (nginx 1.9.13) changed the minimum number of buffers to trigger this from IOV_MAX (typically 1024) to NGX_IOVS_PREALLOCATE (typically 64). Fix is to skip such buffers in ngx_chain_to_iovec(), much like it is done in other places.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 31 May 2016 05:13:30 +0300
parents d620f497c50f
children
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/
/ Copyright (C) Igor Sysoev
/ Copyright (C) Nginx, Inc.
/


/  "casa   [%o2] 0x80, %o1, %o0"  and
/  "casxa  [%o2] 0x80, %o1, %o0"  do the following:
/
/       if ([%o2] == %o1) {
/           swap(%o0, [%o2]);
/       } else {
/           %o0 = [%o2];
/       }


/ ngx_atomic_uint_t ngx_casa(ngx_atomic_uint_t set, ngx_atomic_uint_t old,
/      ngx_atomic_t *lock);
/
/ the arguments are passed in the %o0, %o1, %o2
/ the result is returned in the %o0

        .inline ngx_casa,0
        casa    [%o2] 0x80, %o1, %o0
        .end


/ ngx_atomic_uint_t ngx_casxa(ngx_atomic_uint_t set, ngx_atomic_uint_t old,
/      ngx_atomic_t *lock);
/
/ the arguments are passed in the %o0, %o1, %o2
/ the result is returned in the %o0

        .inline ngx_casxa,0
        casxa   [%o2] 0x80, %o1, %o0
        .end